gir: Update annotations from GLib git master

1 files changed, 662 insertions, 646 deletions

diff --git a/gir/gio-2.0.c b/gir/gio-2.0.c
index 77e7e0f3..841cad4b 100644
--- a/gir/gio-2.0.c
+++ b/gir/gio-2.0.c
@@ -594,7 +594,7 @@
  * GDBusAuthObserver::authorize-authenticated-peer:
  * @observer: The #GDBusAuthObserver emitting the signal.
  * @stream: A #GIOStream for the #GDBusConnection.
- * @credentials: (allow-none): Credentials received from the peer or %NULL.
+ * @credentials: (nullable): Credentials received from the peer or %NULL.
  *
  * Emitted to check if a peer that is successfully authenticated
  * is authorized.
@@ -629,7 +629,7 @@
  * @connection: the #GDBusConnection emitting the signal
  * @remote_peer_vanished: %TRUE if @connection is closed because the
  *     remote peer closed its end of the connection
- * @error: (allow-none): a #GError with more details about the event or %NULL
+ * @error: (nullable): a #GError with more details about the event or %NULL
  *
  * Emitted when the connection is closed.
  *
@@ -1192,7 +1192,7 @@
 /**
  * GDBusProxy::g-signal:
  * @proxy: The #GDBusProxy emitting the signal.
- * @sender_name: (allow-none): The sender of the signal or %NULL if the connection is not a bus connection.
+ * @sender_name: (nullable): The sender of the signal or %NULL if the connection is not a bus connection.
  * @signal_name: The name of the signal.
  * @parameters: A #GVariant tuple with parameters for the signal.
  *
@@ -1741,7 +1741,7 @@
  * GFileMonitor::changed:
  * @monitor: a #GFileMonitor.
  * @file: a #GFile.
- * @other_file: (allow-none): a #GFile or #NULL.
+ * @other_file: (nullable): a #GFile or #NULL.
  * @event_type: a #GFileMonitorEvent.
  *
  * Emitted when @file has been changed.
@@ -2700,7 +2700,7 @@
 /**
  * GSettings::change-event:
  * @settings: the object on which the signal was emitted
- * @keys: (array length=n_keys) (element-type GQuark) (allow-none):
+ * @keys: (array length=n_keys) (element-type GQuark) (nullable):
  *        an array of #GQuarks for the changed keys, or %NULL
  * @n_keys: the length of the @keys array, or 0
  *
@@ -2895,7 +2895,7 @@
 /**
  * GSimpleAction::activate:
  * @simple: the #GSimpleAction
- * @parameter: (allow-none): the parameter to the activation
+ * @parameter: (nullable): the parameter to the activation
  *
  * Indicates that the action was just activated.
  *
@@ -2917,7 +2917,7 @@
 /**
  * GSimpleAction::change-state:
  * @simple: the #GSimpleAction
- * @value: (allow-none): the requested value for the state
+ * @value: (nullable): the requested value for the state
  *
  * Indicates that the action just received a request to change its
  * state.
@@ -3232,7 +3232,7 @@
  * GSocketService::incoming:
  * @service: the #GSocketService
  * @connection: a new #GSocketConnection object
- * @source_object: (allow-none): the source_object passed to
+ * @source_object: (nullable): the source_object passed to
  *     g_socket_listener_add_address()
  *
  * The ::incoming signal is emitted when a new incoming connection
@@ -11613,9 +11613,9 @@
 /**
  * _g_io_module_get_default:
  * @extension_point: the name of an extension point
- * @envvar: (allow-none): the name of an environment variable to
+ * @envvar: (nullable): the name of an environment variable to
  *     override the default implementation.
- * @verify_func: (allow-none): a function to call to verify that
+ * @verify_func: (nullable): a function to call to verify that
  *     a given implementation is usable in the current environment.
  *
  * Retrieves the default object implementing @extension_point.
@@ -11643,7 +11643,7 @@
 /**
  * _g_io_module_get_default_type:
  * @extension_point: the name of an extension point
- * @envvar: (allow-none): the name of an environment variable to
+ * @envvar: (nullable): the name of an environment variable to
  *     override the default implementation.
  * @is_supported_offset: a vtable offset, or zero
  *
@@ -11681,7 +11681,7 @@
 /**
  * g_action_activate:
  * @action: a #GAction
- * @parameter: (allow-none): the parameter to the activation
+ * @parameter: (nullable): the parameter to the activation
  *
  * Activates the action.
  *
@@ -11753,7 +11753,7 @@
  * In the case that this function returns %NULL, you must not give any
  * #GVariant, but %NULL instead.
  *
- * Returns: (allow-none): the parameter type
+ * Returns: (nullable): the parameter type
  * Since: 2.28
  */
 
@@ -11821,7 +11821,7 @@
  * then this function will return %NULL. In that case, g_action_get_state()
  * will return %NULL and you must not call g_action_change_state().
  *
- * Returns: (allow-none): the state type, if the action is stateful
+ * Returns: (nullable): the state type, if the action is stateful
  * Since: 2.28
  */
 
@@ -11884,7 +11884,7 @@
  * g_action_group_activate_action:
  * @action_group: a #GActionGroup
  * @action_name: the name of the action to activate
- * @parameter: (allow-none): parameters to the activation
+ * @parameter: (nullable): parameters to the activation
  *
  * Activate the named action within @action_group.
  *
@@ -12065,10 +12065,10 @@
  * @action_group: a #GActionGroup
  * @action_name: the name of an action in the group
  * @enabled: (out): if the action is presently enabled
- * @parameter_type: (out) (allow-none): the parameter type, or %NULL if none needed
- * @state_type: (out) (allow-none): the state type, or %NULL if stateless
- * @state_hint: (out) (allow-none): the state hint, or %NULL if none
- * @state: (out) (allow-none): the current state, or %NULL if stateless
+ * @parameter_type: (out) (optional): the parameter type, or %NULL if none needed
+ * @state_type: (out) (optional): the state type, or %NULL if stateless
+ * @state_hint: (out) (optional): the state hint, or %NULL if none
+ * @state: (out) (optional): the current state, or %NULL if stateless
  *
  * Queries all aspects of the named action within an @action_group.
  *
@@ -12253,7 +12253,7 @@
 /**
  * g_action_print_detailed_name:
  * @action_name: a valid action name
- * @target_value: (allow-none): a #GVariant target value, or %NULL
+ * @target_value: (nullable): a #GVariant target value, or %NULL
  *
  * Formats a detailed action name from @action_name and @target_value.
  *
@@ -12310,7 +12310,7 @@
 /**
  * g_app_info_create_from_commandline:
  * @commandline: the commandline to use
- * @application_name: (allow-none): the application name, or %NULL to use @commandline
+ * @application_name: (nullable): the application name, or %NULL to use @commandline
  * @flags: flags that can specify details of the created #GAppInfo
  * @error: a #GError location to store the error occurring, %NULL to ignore.
  *
@@ -12554,8 +12554,8 @@
 /**
  * g_app_info_launch:
  * @appinfo: a #GAppInfo
- * @files: (allow-none) (element-type GFile): a #GList of #GFile objects
- * @launch_context: (allow-none): a #GAppLaunchContext or %NULL
+ * @files: (nullable) (element-type GFile): a #GList of #GFile objects
+ * @launch_context: (nullable): a #GAppLaunchContext or %NULL
  * @error: a #GError
  *
  * Launches the application. Passes @files to the launched application
@@ -12593,7 +12593,7 @@
 /**
  * g_app_info_launch_default_for_uri:
  * @uri: the uri to show
- * @launch_context: (allow-none): an optional #GAppLaunchContext
+ * @launch_context: (nullable): an optional #GAppLaunchContext
  * @error: (nullable): return location for an error, or %NULL
  *
  * Utility function that launches the default application
@@ -12608,10 +12608,10 @@
 /**
  * g_app_info_launch_default_for_uri_async:
  * @uri: the uri to show
- * @context: (allow-none): an optional #GAppLaunchContext
- * cancellable: (allow-none): a #GCancellable
- * @callback: (allow-none): a #GASyncReadyCallback to call when the request is done
- * @user_data: (allow-none): data to pass to @callback
+ * @context: (nullable): an optional #GAppLaunchContext
+ * cancellable: (nullable): a #GCancellable
+ * @callback: (nullable): a #GASyncReadyCallback to call when the request is done
+ * @user_data: (nullable): data to pass to @callback
  *
  * Async version of g_app_info_launch_default_for_uri().
  *
@@ -12639,8 +12639,8 @@
 /**
  * g_app_info_launch_uris:
  * @appinfo: a #GAppInfo
- * @uris: (allow-none) (element-type utf8): a #GList containing URIs to launch.
- * @launch_context: (allow-none): a #GAppLaunchContext or %NULL
+ * @uris: (nullable) (element-type utf8): a #GList containing URIs to launch.
+ * @launch_context: (nullable): a #GAppLaunchContext or %NULL
  * @error: a #GError
  *
  * Launches the application. This passes the @uris to the launched application
@@ -13045,7 +13045,7 @@
 /**
  * g_application_command_line_get_arguments:
  * @cmdline: a #GApplicationCommandLine
- * @argc: (out) (allow-none): the length of the arguments array, or %NULL
+ * @argc: (out) (optional): the length of the arguments array, or %NULL
  *
  * Gets the list of arguments that was passed on the command line.
  *
@@ -13501,7 +13501,7 @@
 
 /**
  * g_application_new:
- * @application_id: (allow-none): the application id
+ * @application_id: (nullable): the application id
  * @flags: the application flags
  *
  * Creates a new #GApplication instance.
@@ -13563,7 +13563,7 @@
 /**
  * g_application_register:
  * @application: a #GApplication
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a NULL #GError, or %NULL
  *
  * Attempts registration of the application.
@@ -13619,7 +13619,7 @@
  * g_application_run:
  * @application: a #GApplication
  * @argc: the argc from main() (or 0 if @argv is %NULL)
- * @argv: (array length=argc) (allow-none): the argv from main(), or %NULL
+ * @argv: (array length=argc) (nullable): the argv from main(), or %NULL
  *
  * Runs the application.
  *
@@ -13705,7 +13705,7 @@
 /**
  * g_application_send_notification:
  * @application: a #GApplication
- * @id: (allow-none): id of the notification, or %NULL
+ * @id: (nullable): id of the notification, or %NULL
  * @notification: the #GNotification to send
  *
  * Sends a notification on behalf of @application to the desktop shell.
@@ -13742,7 +13742,7 @@
 /**
  * g_application_set_action_group:
  * @application: a #GApplication
- * @action_group: (allow-none): a #GActionGroup, or %NULL
+ * @action_group: (nullable): a #GActionGroup, or %NULL
  *
  * This used to be how actions were associated with a #GApplication.
  * Now there is #GActionMap for that.
@@ -13759,7 +13759,7 @@
 /**
  * g_application_set_application_id:
  * @application: a #GApplication
- * @application_id: (allow-none): the identifier for @application
+ * @application_id: (nullable): the identifier for @application
  *
  * Sets the unique identifier for @application.
  *
@@ -13775,7 +13775,7 @@
 
 /**
  * g_application_set_default:
- * @application: (allow-none): the application to set as default, or %NULL
+ * @application: (nullable): the application to set as default, or %NULL
  *
  * Sets or unsets the default application for the process, as returned
  * by g_application_get_default().
@@ -13988,7 +13988,7 @@
  * @callback: a #GAsyncReadyCallback to call when the initialization is
  *     finished
  * @user_data: the data to pass to callback function
- * @first_property_name: (allow-none): the name of the first property, or %NULL if no
+ * @first_property_name: (nullable): the name of the first property, or %NULL if no
  *     properties
  * @...: the value of the first property, followed by other property
  *    value pairs, and ended by %NULL.
@@ -14126,7 +14126,7 @@
  * g_buffered_input_stream_fill:
  * @stream: a #GBufferedInputStream
  * @count: the number of bytes that will be read from the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to read @count bytes from the stream into the buffer.
@@ -14164,7 +14164,7 @@
  * @stream: a #GBufferedInputStream
  * @count: the number of bytes that will be read from the stream
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object
+ * @cancellable: (nullable): optional #GCancellable object
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): a #gpointer
  *
@@ -14264,7 +14264,7 @@
 /**
  * g_buffered_input_stream_read_byte:
  * @stream: a #GBufferedInputStream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to read a single byte from the stream or the buffer. Will block
@@ -14362,7 +14362,7 @@
 /**
  * g_bus_get:
  * @bus_type: a #GBusType
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: the data to pass to @callback
  *
@@ -14404,7 +14404,7 @@
 /**
  * g_bus_get_sync:
  * @bus_type: a #GBusType
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously connects to the message bus specified by @bus_type.
@@ -14435,11 +14435,11 @@
  * @bus_type: the type of bus to own a name on
  * @name: the well-known name to own
  * @flags: a set of flags from the #GBusNameOwnerFlags enumeration
- * @bus_acquired_handler: (allow-none): handler to invoke when connected to the bus of type @bus_type or %NULL
- * @name_acquired_handler: (allow-none): handler to invoke when @name is acquired or %NULL
- * @name_lost_handler: (allow-none): handler to invoke when @name is lost or %NULL
+ * @bus_acquired_handler: (nullable): handler to invoke when connected to the bus of type @bus_type or %NULL
+ * @name_acquired_handler: (nullable): handler to invoke when @name is acquired or %NULL
+ * @name_lost_handler: (nullable): handler to invoke when @name is lost or %NULL
  * @user_data: user data to pass to handlers
- * @user_data_free_func: (allow-none): function for freeing @user_data or %NULL
+ * @user_data_free_func: (nullable): function for freeing @user_data or %NULL
  *
  * Starts acquiring @name on the bus specified by @bus_type and calls
  * @name_acquired_handler and @name_lost_handler when the name is
@@ -14502,10 +14502,10 @@
  * @connection: a #GDBusConnection
  * @name: the well-known name to own
  * @flags: a set of flags from the #GBusNameOwnerFlags enumeration
- * @name_acquired_handler: (allow-none): handler to invoke when @name is acquired or %NULL
- * @name_lost_handler: (allow-none): handler to invoke when @name is lost or %NULL
+ * @name_acquired_handler: (nullable): handler to invoke when @name is acquired or %NULL
+ * @name_lost_handler: (nullable): handler to invoke when @name is lost or %NULL
  * @user_data: user data to pass to handlers
- * @user_data_free_func: (allow-none): function for freeing @user_data or %NULL
+ * @user_data_free_func: (nullable): function for freeing @user_data or %NULL
  *
  * Like g_bus_own_name() but takes a #GDBusConnection instead of a
  * #GBusType.
@@ -14521,9 +14521,9 @@
  * @connection: a #GDBusConnection
  * @name: the well-known name to own
  * @flags: a set of flags from the #GBusNameOwnerFlags enumeration
- * @name_acquired_closure: (allow-none): #GClosure to invoke when @name is
+ * @name_acquired_closure: (nullable): #GClosure to invoke when @name is
  *     acquired or %NULL
- * @name_lost_closure: (allow-none): #GClosure to invoke when @name is lost
+ * @name_lost_closure: (nullable): #GClosure to invoke when @name is lost
  *     or %NULL
  *
  * Version of g_bus_own_name_on_connection() using closures instead of
@@ -14540,11 +14540,11 @@
  * @bus_type: the type of bus to own a name on
  * @name: the well-known name to own
  * @flags: a set of flags from the #GBusNameOwnerFlags enumeration
- * @bus_acquired_closure: (allow-none): #GClosure to invoke when connected to
+ * @bus_acquired_closure: (nullable): #GClosure to invoke when connected to
  *     the bus of type @bus_type or %NULL
- * @name_acquired_closure: (allow-none): #GClosure to invoke when @name is
+ * @name_acquired_closure: (nullable): #GClosure to invoke when @name is
  *     acquired or %NULL
- * @name_lost_closure: (allow-none): #GClosure to invoke when @name is lost or
+ * @name_lost_closure: (nullable): #GClosure to invoke when @name is lost or
  *     %NULL
  *
  * Version of g_bus_own_name() using closures instead of callbacks for
@@ -14581,10 +14581,10 @@
  * @bus_type: The type of bus to watch a name on.
  * @name: The name (well-known or unique) to watch.
  * @flags: Flags from the #GBusNameWatcherFlags enumeration.
- * @name_appeared_handler: (allow-none): Handler to invoke when @name is known to exist or %NULL.
- * @name_vanished_handler: (allow-none): Handler to invoke when @name is known to not exist or %NULL.
+ * @name_appeared_handler: (nullable): Handler to invoke when @name is known to exist or %NULL.
+ * @name_vanished_handler: (nullable): Handler to invoke when @name is known to not exist or %NULL.
  * @user_data: User data to pass to handlers.
- * @user_data_free_func: (allow-none): Function for freeing @user_data or %NULL.
+ * @user_data_free_func: (nullable): Function for freeing @user_data or %NULL.
  *
  * Starts watching @name on the bus specified by @bus_type and calls
  * @name_appeared_handler and @name_vanished_handler when the name is
@@ -14627,10 +14627,10 @@
  * @connection: A #GDBusConnection.
  * @name: The name (well-known or unique) to watch.
  * @flags: Flags from the #GBusNameWatcherFlags enumeration.
- * @name_appeared_handler: (allow-none): Handler to invoke when @name is known to exist or %NULL.
- * @name_vanished_handler: (allow-none): Handler to invoke when @name is known to not exist or %NULL.
+ * @name_appeared_handler: (nullable): Handler to invoke when @name is known to exist or %NULL.
+ * @name_vanished_handler: (nullable): Handler to invoke when @name is known to not exist or %NULL.
  * @user_data: User data to pass to handlers.
- * @user_data_free_func: (allow-none): Function for freeing @user_data or %NULL.
+ * @user_data_free_func: (nullable): Function for freeing @user_data or %NULL.
  *
  * Like g_bus_watch_name() but takes a #GDBusConnection instead of a
  * #GBusType.
@@ -14646,9 +14646,9 @@
  * @connection: A #GDBusConnection.
  * @name: The name (well-known or unique) to watch.
  * @flags: Flags from the #GBusNameWatcherFlags enumeration.
- * @name_appeared_closure: (allow-none): #GClosure to invoke when @name is known
+ * @name_appeared_closure: (nullable): #GClosure to invoke when @name is known
  * to exist or %NULL.
- * @name_vanished_closure: (allow-none): #GClosure to invoke when @name is known
+ * @name_vanished_closure: (nullable): #GClosure to invoke when @name is known
  * to not exist or %NULL.
  *
  * Version of g_bus_watch_name_on_connection() using closures instead of callbacks for
@@ -14665,9 +14665,9 @@
  * @bus_type: The type of bus to watch a name on.
  * @name: The name (well-known or unique) to watch.
  * @flags: Flags from the #GBusNameWatcherFlags enumeration.
- * @name_appeared_closure: (allow-none): #GClosure to invoke when @name is known
+ * @name_appeared_closure: (nullable): #GClosure to invoke when @name is known
  * to exist or %NULL.
- * @name_vanished_closure: (allow-none): #GClosure to invoke when @name is known
+ * @name_vanished_closure: (nullable): #GClosure to invoke when @name is known
  * to not exist or %NULL.
  *
  * Version of g_bus_watch_name() using closures instead of callbacks for
@@ -14730,7 +14730,7 @@
  * @cancellable: A #GCancellable.
  * @callback: The #GCallback to connect.
  * @data: Data to pass to @callback.
- * @data_destroy_func: (allow-none): Free function for @data or %NULL.
+ * @data_destroy_func: (nullable): Free function for @data or %NULL.
  *
  * Convenience function to connect to the #GCancellable::cancelled
  * signal. Also handles the race condition that may happen
@@ -14759,7 +14759,7 @@
 
 /**
  * g_cancellable_disconnect:
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @handler_id: Handler id of the handler to be disconnected, or %0.
  *
  * Disconnects a handler from a cancellable instance similar to
@@ -14816,7 +14816,7 @@
 
 /**
  * g_cancellable_is_cancelled:
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  *
  * Checks if a cancellable job has been cancelled.
  *
@@ -14827,7 +14827,7 @@
 
 /**
  * g_cancellable_make_pollfd:
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @pollfd: a pointer to a #GPollFD
  *
  * Creates a #GPollFD corresponding to @cancellable; this can be passed
@@ -14933,7 +14933,7 @@
 
 /**
  * g_cancellable_set_error_if_cancelled:
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: #GError to append error state to
  *
  * If the @cancellable is cancelled, sets the error to notify
@@ -14945,7 +14945,7 @@
 
 /**
  * g_cancellable_source_new: (skip)
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  *
  * Creates a source that triggers if @cancellable is cancelled and
  * calls its callback of type #GCancellableSourceFunc. This is
@@ -15065,7 +15065,7 @@
  * [shared-mime-info](http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec)
  * specification for more on the generic icon name.
  *
- * Returns: (allow-none): the registered generic icon name for the given @type,
+ * Returns: (nullable): the registered generic icon name for the given @type,
  *     or %NULL if unknown. Free with g_free()
  * Since: 2.34
  */
@@ -15107,10 +15107,10 @@
 
 /**
  * g_content_type_guess:
- * @filename: (allow-none): a string, or %NULL
- * @data: (allow-none) (array length=data_size): a stream of data, or %NULL
+ * @filename: (nullable): a string, or %NULL
+ * @data: (nullable) (array length=data_size): a stream of data, or %NULL
  * @data_size: the size of @data
- * @result_uncertain: (allow-none) (out): return location for the certainty
+ * @result_uncertain: (out) (optional): return location for the certainty
  *     of the result, or %NULL
  *
  * Guesses the content type based on example data. If the function is
@@ -15504,7 +15504,7 @@
 /**
  * g_data_input_stream_read_byte:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads an unsigned 8-bit/1-byte value from @stream.
@@ -15517,7 +15517,7 @@
 /**
  * g_data_input_stream_read_int16:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a 16-bit/2-byte value from @stream.
@@ -15533,7 +15533,7 @@
 /**
  * g_data_input_stream_read_int32:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a signed 32-bit/4-byte value from @stream.
@@ -15553,7 +15553,7 @@
 /**
  * g_data_input_stream_read_int64:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a 64-bit/8-byte value from @stream.
@@ -15574,7 +15574,7 @@
  * g_data_input_stream_read_line:
  * @stream: a given #GDataInputStream.
  * @length: (out): a #gsize to get the length of the data read in.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a line from the data input stream.  Note that no encoding
@@ -15598,7 +15598,7 @@
  * g_data_input_stream_read_line_async:
  * @stream: a given #GDataInputStream.
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied.
  * @user_data: (closure): the data to pass to callback function.
  *
@@ -15659,7 +15659,7 @@
  * g_data_input_stream_read_line_utf8:
  * @stream: a given #GDataInputStream.
  * @length: (out): a #gsize to get the length of the data read in.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a UTF-8 encoded line from the data input stream.
@@ -15682,7 +15682,7 @@
 /**
  * g_data_input_stream_read_uint16:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads an unsigned 16-bit/2-byte value from @stream.
@@ -15698,7 +15698,7 @@
 /**
  * g_data_input_stream_read_uint32:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads an unsigned 32-bit/4-byte value from @stream.
@@ -15718,7 +15718,7 @@
 /**
  * g_data_input_stream_read_uint64:
  * @stream: a given #GDataInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads an unsigned 64-bit/8-byte value from @stream.
@@ -15740,7 +15740,7 @@
  * @stream: a given #GDataInputStream.
  * @stop_chars: characters to terminate the read.
  * @length: (out): a #gsize to get the length of the data read in.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting.
  *
  * Reads a string from the data input stream, up to the first
@@ -15767,7 +15767,7 @@
  * @stream: a given #GDataInputStream.
  * @stop_chars: characters to terminate the read.
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied.
  * @user_data: (closure): the data to pass to callback function.
  *
@@ -15816,7 +15816,7 @@
  * @stop_chars_len: length of @stop_chars. May be -1 if @stop_chars is
  *     nul-terminated
  * @length: (out): a #gsize to get the length of the data read in
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @error: #GError for error reporting
  *
  * Reads a string from the data input stream, up to the first
@@ -15845,7 +15845,7 @@
  * @stop_chars_len: length of @stop_chars. May be -1 if @stop_chars is
  *     nul-terminated
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -15937,7 +15937,7 @@
  * g_data_output_stream_put_byte:
  * @stream: a #GDataOutputStream.
  * @data: a #guchar.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a byte into the output stream.
@@ -15950,7 +15950,7 @@
  * g_data_output_stream_put_int16:
  * @stream: a #GDataOutputStream.
  * @data: a #gint16.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 16-bit integer into the output stream.
@@ -15963,7 +15963,7 @@
  * g_data_output_stream_put_int32:
  * @stream: a #GDataOutputStream.
  * @data: a #gint32.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 32-bit integer into the output stream.
@@ -15976,7 +15976,7 @@
  * g_data_output_stream_put_int64:
  * @stream: a #GDataOutputStream.
  * @data: a #gint64.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 64-bit integer into the stream.
@@ -15989,7 +15989,7 @@
  * g_data_output_stream_put_string:
  * @stream: a #GDataOutputStream.
  * @str: a string.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a string into the output stream.
@@ -16002,7 +16002,7 @@
  * g_data_output_stream_put_uint16:
  * @stream: a #GDataOutputStream.
  * @data: a #guint16.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 16-bit integer into the output stream.
@@ -16015,7 +16015,7 @@
  * g_data_output_stream_put_uint32:
  * @stream: a #GDataOutputStream.
  * @data: a #guint32.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 32-bit integer into the stream.
@@ -16028,7 +16028,7 @@
  * g_data_output_stream_put_uint64:
  * @stream: a #GDataOutputStream.
  * @data: a #guint64.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 64-bit integer into the stream.
@@ -16148,7 +16148,7 @@
  * @flags: an int containing #GSocketMsgFlags flags for the overall operation
  * @timeout: the maximum time (in microseconds) to wait, 0 to not block, or -1
  *   to block indefinitely
- * @cancellable: (allow-none): a %GCancellable
+ * @cancellable: (nullable): a %GCancellable
  * @error: return location for a #GError
  *
  * Receive one or more data messages from @datagram_based in one go.
@@ -16319,7 +16319,7 @@
 /**
  * g_dbus_address_get_for_bus_sync:
  * @bus_type: a #GBusType
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously looks up the D-Bus address for the well-known message
@@ -16335,7 +16335,7 @@
 /**
  * g_dbus_address_get_stream:
  * @address: A valid D-Bus address.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
  * @user_data: Data to pass to @callback.
  *
@@ -16371,7 +16371,7 @@
  * g_dbus_address_get_stream_sync:
  * @address: A valid D-Bus address.
  * @out_guid: (optional) (out): %NULL or return location to store the GUID extracted from @address, if any.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Synchronously connects to an endpoint specified by @address and
@@ -16388,7 +16388,7 @@
 
 /**
  * g_dbus_annotation_info_lookup:
- * @annotations: (array zero-terminated=1) (allow-none): A %NULL-terminated array of annotations or %NULL.
+ * @annotations: (array zero-terminated=1) (nullable): A %NULL-terminated array of annotations or %NULL.
  * @name: The name of the annotation to look up.
  *
  * Looks up the value of an annotation.
@@ -16464,7 +16464,7 @@
  * g_dbus_auth_observer_authorize_authenticated_peer:
  * @observer: A #GDBusAuthObserver.
  * @stream: A #GIOStream for the #GDBusConnection.
- * @credentials: (allow-none): Credentials received from the peer or %NULL.
+ * @credentials: (nullable): Credentials received from the peer or %NULL.
  *
  * Emits the #GDBusAuthObserver::authorize-authenticated-peer signal on @observer.
  *
@@ -16528,19 +16528,19 @@
 /**
  * g_dbus_connection_call:
  * @connection: a #GDBusConnection
- * @bus_name: (allow-none): a unique or well-known bus name or %NULL if
+ * @bus_name: (nullable): a unique or well-known bus name or %NULL if
  *     @connection is not a message bus connection
  * @object_path: path of remote object
  * @interface_name: D-Bus interface to invoke method on
  * @method_name: the name of the method to invoke
- * @parameters: (allow-none): a #GVariant tuple with parameters for the method
+ * @parameters: (nullable): a #GVariant tuple with parameters for the method
  *     or %NULL if not passing parameters
- * @reply_type: (allow-none): the expected type of the reply, or %NULL
+ * @reply_type: (nullable): the expected type of the reply, or %NULL
  * @flags: flags from the #GDBusCallFlags enumeration
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @cancellable: (allow-none): a #GCancellable or %NULL
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the request
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the request
  *     is satisfied or %NULL if you don't care about the result of the
  *     method invocation
  * @user_data: the data to pass to @callback
@@ -16610,18 +16610,18 @@
 /**
  * g_dbus_connection_call_sync:
  * @connection: a #GDBusConnection
- * @bus_name: (allow-none): a unique or well-known bus name or %NULL if
+ * @bus_name: (nullable): a unique or well-known bus name or %NULL if
  *     @connection is not a message bus connection
  * @object_path: path of remote object
  * @interface_name: D-Bus interface to invoke method on
  * @method_name: the name of the method to invoke
- * @parameters: (allow-none): a #GVariant tuple with parameters for the method
+ * @parameters: (nullable): a #GVariant tuple with parameters for the method
  *     or %NULL if not passing parameters
- * @reply_type: (allow-none): the expected type of the reply, or %NULL
+ * @reply_type: (nullable): the expected type of the reply, or %NULL
  * @flags: flags from the #GDBusCallFlags enumeration
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously invokes the @method_name method on the
@@ -16670,20 +16670,20 @@
 /**
  * g_dbus_connection_call_with_unix_fd_list:
  * @connection: a #GDBusConnection
- * @bus_name: (allow-none): a unique or well-known bus name or %NULL if
+ * @bus_name: (nullable): a unique or well-known bus name or %NULL if
  *     @connection is not a message bus connection
  * @object_path: path of remote object
  * @interface_name: D-Bus interface to invoke method on
  * @method_name: the name of the method to invoke
- * @parameters: (allow-none): a #GVariant tuple with parameters for the method
+ * @parameters: (nullable): a #GVariant tuple with parameters for the method
  *     or %NULL if not passing parameters
- * @reply_type: (allow-none): the expected type of the reply, or %NULL
+ * @reply_type: (nullable): the expected type of the reply, or %NULL
  * @flags: flags from the #GDBusCallFlags enumeration
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @fd_list: (allow-none): a #GUnixFDList or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the request is
+ * @fd_list: (nullable): a #GUnixFDList or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the request is
  *     satisfied or %NULL if you don't * care about the result of the
  *     method invocation
  * @user_data: The data to pass to @callback.
@@ -16699,7 +16699,7 @@
 /**
  * g_dbus_connection_call_with_unix_fd_list_finish:
  * @connection: a #GDBusConnection
- * @out_fd_list: (out) (allow-none): return location for a #GUnixFDList or %NULL
+ * @out_fd_list: (out) (optional): return location for a #GUnixFDList or %NULL
  * @res: a #GAsyncResult obtained from the #GAsyncReadyCallback passed to
  *     g_dbus_connection_call_with_unix_fd_list()
  * @error: return location for error or %NULL
@@ -16715,20 +16715,20 @@
 /**
  * g_dbus_connection_call_with_unix_fd_list_sync:
  * @connection: a #GDBusConnection
- * @bus_name: (allow-none): a unique or well-known bus name or %NULL
+ * @bus_name: (nullable): a unique or well-known bus name or %NULL
  *     if @connection is not a message bus connection
  * @object_path: path of remote object
  * @interface_name: D-Bus interface to invoke method on
  * @method_name: the name of the method to invoke
- * @parameters: (allow-none): a #GVariant tuple with parameters for
+ * @parameters: (nullable): a #GVariant tuple with parameters for
  *     the method or %NULL if not passing parameters
- * @reply_type: (allow-none): the expected type of the reply, or %NULL
+ * @reply_type: (nullable): the expected type of the reply, or %NULL
  * @flags: flags from the #GDBusCallFlags enumeration
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @fd_list: (allow-none): a #GUnixFDList or %NULL
- * @out_fd_list: (out) (allow-none): return location for a #GUnixFDList or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @fd_list: (nullable): a #GUnixFDList or %NULL
+ * @out_fd_list: (out) (optional): return location for a #GUnixFDList or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Like g_dbus_connection_call_sync() but also takes and returns #GUnixFDList objects.
@@ -16744,8 +16744,8 @@
 /**
  * g_dbus_connection_close:
  * @connection: a #GDBusConnection
- * @cancellable: (allow-none): a #GCancellable or %NULL
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the request is
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the request is
  *     satisfied or %NULL if you don't care about the result
  * @user_data: The data to pass to @callback
  *
@@ -16795,7 +16795,7 @@
 /**
  * g_dbus_connection_close_sync:
  * @connection: a #GDBusConnection
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously closees @connection. The calling thread is blocked
@@ -16811,12 +16811,12 @@
 /**
  * g_dbus_connection_emit_signal:
  * @connection: a #GDBusConnection
- * @destination_bus_name: (allow-none): the unique bus name for the destination
+ * @destination_bus_name: (nullable): the unique bus name for the destination
  *     for the signal or %NULL to emit to all listeners
  * @object_path: path of remote object
  * @interface_name: D-Bus interface to emit a signal on
  * @signal_name: the name of the signal to emit
- * @parameters: (allow-none): a #GVariant tuple with parameters for the signal
+ * @parameters: (nullable): a #GVariant tuple with parameters for the signal
  *              or %NULL if not passing parameters
  * @error: Return location for error or %NULL
  *
@@ -16893,8 +16893,8 @@
 /**
  * g_dbus_connection_flush:
  * @connection: a #GDBusConnection
- * @cancellable: (allow-none): a #GCancellable or %NULL
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the
  *     request is satisfied or %NULL if you don't care about the result
  * @user_data: The data to pass to @callback
  *
@@ -16934,7 +16934,7 @@
 /**
  * g_dbus_connection_flush_sync:
  * @connection: a #GDBusConnection
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously flushes @connection. The calling thread is blocked
@@ -17065,10 +17065,10 @@
 /**
  * g_dbus_connection_new:
  * @stream: a #GIOStream
- * @guid: (allow-none): the GUID to use if a authenticating as a server or %NULL
+ * @guid: (nullable): the GUID to use if a authenticating as a server or %NULL
  * @flags: flags describing how to make the connection
- * @observer: (allow-none): a #GDBusAuthObserver or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @observer: (nullable): a #GDBusAuthObserver or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: the data to pass to @callback
  *
@@ -17115,8 +17115,8 @@
  * g_dbus_connection_new_for_address:
  * @address: a D-Bus address
  * @flags: flags describing how to make the connection
- * @observer: (allow-none): a #GDBusAuthObserver or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @observer: (nullable): a #GDBusAuthObserver or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: the data to pass to @callback
  *
@@ -17163,8 +17163,8 @@
  * g_dbus_connection_new_for_address_sync:
  * @address: a D-Bus address
  * @flags: flags describing how to make the connection
- * @observer: (allow-none): a #GDBusAuthObserver or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @observer: (nullable): a #GDBusAuthObserver or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously connects and sets up a D-Bus client connection for
@@ -17192,10 +17192,10 @@
 /**
  * g_dbus_connection_new_sync:
  * @stream: a #GIOStream
- * @guid: (allow-none): the GUID to use if a authenticating as a server or %NULL
+ * @guid: (nullable): the GUID to use if a authenticating as a server or %NULL
  * @flags: flags describing how to make the connection
- * @observer: (allow-none): a #GDBusAuthObserver or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @observer: (nullable): a #GDBusAuthObserver or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously sets up a D-Bus connection for exchanging D-Bus messages
@@ -17224,8 +17224,8 @@
  * @connection: a #GDBusConnection
  * @object_path: the object path to register at
  * @interface_info: introspection data for the interface
- * @vtable: (allow-none): a #GDBusInterfaceVTable to call into or %NULL
- * @user_data: (allow-none): data to pass to functions in @vtable
+ * @vtable: (nullable): a #GDBusInterfaceVTable to call into or %NULL
+ * @user_data: (nullable): data to pass to functions in @vtable
  * @user_data_free_func: function to call when the object path is unregistered
  * @error: return location for error or %NULL
  *
@@ -17368,7 +17368,7 @@
  * @connection: a #GDBusConnection
  * @message: a #GDBusMessage
  * @flags: flags affecting how the message is sent
- * @out_serial: (out) (allow-none): return location for serial number assigned
+ * @out_serial: (out) (optional): return location for serial number assigned
  *     to @message when sending it or %NULL
  * @error: Return location for error or %NULL
  *
@@ -17405,10 +17405,10 @@
  * @flags: flags affecting how the message is sent
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @out_serial: (out) (allow-none): return location for serial number assigned
+ * @out_serial: (out) (optional): return location for serial number assigned
  *     to @message when sending it or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the request
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the request
  *     is satisfied or %NULL if you don't care about the result
  * @user_data: The data to pass to @callback
  *
@@ -17474,9 +17474,9 @@
  * @flags: flags affecting how the message is sent.
  * @timeout_msec: the timeout in milliseconds, -1 to use the default
  *     timeout or %G_MAXINT for no timeout
- * @out_serial: (out) (allow-none): return location for serial number
+ * @out_serial: (out) (optional): return location for serial number
  *     assigned to @message when sending it or %NULL
- * @cancellable: (allow-none): a #GCancellable or %NULL
+ * @cancellable: (nullable): a #GCancellable or %NULL
  * @error: return location for error or %NULL
  *
  * Synchronously sends @message to the peer represented by @connection
@@ -17538,21 +17538,21 @@
 /**
  * g_dbus_connection_signal_subscribe:
  * @connection: a #GDBusConnection
- * @sender: (allow-none): sender name to match on (unique or well-known name)
+ * @sender: (nullable): sender name to match on (unique or well-known name)
  *     or %NULL to listen from all senders
- * @interface_name: (allow-none): D-Bus interface name to match on or %NULL to
+ * @interface_name: (nullable): D-Bus interface name to match on or %NULL to
  *     match on all interfaces
- * @member: (allow-none): D-Bus signal name to match on or %NULL to match on
+ * @member: (nullable): D-Bus signal name to match on or %NULL to match on
  *     all signals
- * @object_path: (allow-none): object path to match on or %NULL to match on
+ * @object_path: (nullable): object path to match on or %NULL to match on
  *     all object paths
- * @arg0: (allow-none): contents of first string argument to match on or %NULL
+ * @arg0: (nullable): contents of first string argument to match on or %NULL
  *     to match on all kinds of arguments
  * @flags: #GDBusSignalFlags describing how arg0 is used in subscribing to the
  *     signal
  * @callback: callback to invoke when there is a signal matching the requested data
  * @user_data: user data to pass to @callback
- * @user_data_free_func: (allow-none): function to free @user_data with when
+ * @user_data_free_func: (nullable): function to free @user_data with when
  *     subscription is removed or %NULL
  *
  * Subscribes to signals on @connection and invokes @callback with a whenever
@@ -17794,7 +17794,7 @@
  * @error: A pointer to a #GError or %NULL.
  * @dbus_error_name: D-Bus error name.
  * @dbus_error_message: D-Bus error message.
- * @format: (allow-none): printf()-style format to prepend to @dbus_error_message or %NULL.
+ * @format: (nullable): printf()-style format to prepend to @dbus_error_message or %NULL.
  * @...: Arguments for @format.
  *
  * Does nothing if @error is %NULL. Otherwise sets *@error to
@@ -17810,7 +17810,7 @@
  * @error: A pointer to a #GError or %NULL.
  * @dbus_error_name: D-Bus error name.
  * @dbus_error_message: D-Bus error message.
- * @format: (allow-none): printf()-style format to prepend to @dbus_error_message or %NULL.
+ * @format: (nullable): printf()-style format to prepend to @dbus_error_message or %NULL.
  * @var_args: Arguments for @format.
  *
  * Like g_dbus_error_set_dbus_error() but intended for language bindings.
@@ -18080,7 +18080,7 @@
 /**
  * g_dbus_interface_set_object:
  * @interface_: An exported D-Bus interface.
- * @object: (allow-none): A #GDBusObject or %NULL.
+ * @object: (nullable): A #GDBusObject or %NULL.
  *
  * Sets the #GDBusObject for @interface_ to @object.
  *
@@ -18667,9 +18667,9 @@
 
 /**
  * g_dbus_message_new_method_call:
- * @name: (allow-none): A valid D-Bus name or %NULL.
+ * @name: (nullable): A valid D-Bus name or %NULL.
  * @path: A valid object path.
- * @interface_: (allow-none): A valid D-Bus interface name or %NULL.
+ * @interface_: (nullable): A valid D-Bus interface name or %NULL.
  * @method: A valid method name.
  *
  * Creates a new #GDBusMessage for a method call.
@@ -18853,7 +18853,7 @@
  * g_dbus_message_set_header:
  * @message: A #GDBusMessage.
  * @header_field: A 8-bit unsigned integer (typically a value from the #GDBusMessageHeaderField enumeration)
- * @value: (allow-none): A #GVariant to set the header field or %NULL to clear the header field.
+ * @value: (nullable): A #GVariant to set the header field or %NULL to clear the header field.
  *
  * Sets a header field on @message.
  *
@@ -18965,7 +18965,7 @@
 /**
  * g_dbus_message_set_unix_fd_list:
  * @message: A #GDBusMessage.
- * @fd_list: (allow-none): A #GUnixFDList or %NULL.
+ * @fd_list: (nullable): A #GUnixFDList or %NULL.
  *
  * Sets the UNIX file descriptors associated with @message. As a
  * side-effect the %G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header
@@ -19183,7 +19183,9 @@
  *
  * Finishes handling a D-Bus method call by returning an error.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.26
  */
@@ -19210,7 +19212,9 @@
  * always register errors with g_dbus_error_register_error()
  * or use g_dbus_method_invocation_return_dbus_error().
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since 2.48, if the method call requested for a reply not to be sent
  * then this call will free @invocation but otherwise do nothing (as per
@@ -19229,7 +19233,9 @@
  *
  * Like g_dbus_method_invocation_return_error() but without printf()-style formatting.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.26
  */
@@ -19246,7 +19252,9 @@
  * Like g_dbus_method_invocation_return_error() but intended for
  * language bindings.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.26
  */
@@ -19260,7 +19268,9 @@
  * Like g_dbus_method_invocation_return_error() but takes a #GError
  * instead of the error domain, error code and message.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.26
  */
@@ -19269,14 +19279,16 @@
 /**
  * g_dbus_method_invocation_return_value:
  * @invocation: (transfer full): A #GDBusMethodInvocation.
- * @parameters: (allow-none): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
+ * @parameters: (nullable): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
  *
  * Finishes handling a D-Bus method call by returning @parameters.
  * If the @parameters GVariant is floating, it is consumed.
  *
  * It is an error if @parameters is not of the right format.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since 2.48, if the method call requested for a reply not to be sent
  * then this call will sink @parameters and free @invocation, but
@@ -19290,14 +19302,16 @@
 /**
  * g_dbus_method_invocation_return_value_with_unix_fd_list:
  * @invocation: (transfer full): A #GDBusMethodInvocation.
- * @parameters: (allow-none): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
- * @fd_list: (allow-none): A #GUnixFDList or %NULL.
+ * @parameters: (nullable): A #GVariant tuple with out parameters for the method or %NULL if not passing any parameters.
+ * @fd_list: (nullable): A #GUnixFDList or %NULL.
  *
  * Like g_dbus_method_invocation_return_value() but also takes a #GUnixFDList.
  *
  * This method is only available on UNIX.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.30
  */
@@ -19311,7 +19325,9 @@
  * Like g_dbus_method_invocation_return_gerror() but takes ownership
  * of @error so the caller does not need to free it.
  *
- * This method will free @invocation, you cannot use it afterwards.
+ * This method will take ownership of @invocation. See
+ * #GDBusInterfaceVTable for more information about the ownership of
+ * @invocation.
  *
  * Since: 2.30
  */
@@ -19486,10 +19502,10 @@
  * @flags: Zero or more flags from the #GDBusObjectManagerClientFlags enumeration.
  * @name: The owner of the control object (unique or well-known name).
  * @object_path: The object path of the control object.
- * @get_proxy_type_func: (allow-none): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
+ * @get_proxy_type_func: (nullable): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
  * @get_proxy_type_user_data: User data to pass to @get_proxy_type_func.
- * @get_proxy_type_destroy_notify: (allow-none): Free function for @get_proxy_type_user_data or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL
+ * @get_proxy_type_destroy_notify: (nullable): Free function for @get_proxy_type_user_data or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL
  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
  * @user_data: The data to pass to @callback.
  *
@@ -19526,10 +19542,10 @@
  * @flags: Zero or more flags from the #GDBusObjectManagerClientFlags enumeration.
  * @name: The owner of the control object (unique or well-known name).
  * @object_path: The object path of the control object.
- * @get_proxy_type_func: (allow-none): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
+ * @get_proxy_type_func: (nullable): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
  * @get_proxy_type_user_data: User data to pass to @get_proxy_type_func.
- * @get_proxy_type_destroy_notify: (allow-none): Free function for @get_proxy_type_user_data or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL
+ * @get_proxy_type_destroy_notify: (nullable): Free function for @get_proxy_type_user_data or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL
  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
  * @user_data: The data to pass to @callback.
  *
@@ -19567,10 +19583,10 @@
  * @flags: Zero or more flags from the #GDBusObjectManagerClientFlags enumeration.
  * @name: The owner of the control object (unique or well-known name).
  * @object_path: The object path of the control object.
- * @get_proxy_type_func: (allow-none): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
+ * @get_proxy_type_func: (nullable): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
  * @get_proxy_type_user_data: User data to pass to @get_proxy_type_func.
- * @get_proxy_type_destroy_notify: (allow-none): Free function for @get_proxy_type_user_data or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL
+ * @get_proxy_type_destroy_notify: (nullable): Free function for @get_proxy_type_user_data or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL
  * @error: Return location for error or %NULL.
  *
  * Like g_dbus_object_manager_client_new_sync() but takes a #GBusType instead
@@ -19591,12 +19607,12 @@
  * g_dbus_object_manager_client_new_sync:
  * @connection: A #GDBusConnection.
  * @flags: Zero or more flags from the #GDBusObjectManagerClientFlags enumeration.
- * @name: (allow-none): The owner of the control object (unique or well-known name), or %NULL when not using a message bus connection.
+ * @name: (nullable): The owner of the control object (unique or well-known name), or %NULL when not using a message bus connection.
  * @object_path: The object path of the control object.
- * @get_proxy_type_func: (allow-none): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
+ * @get_proxy_type_func: (nullable): A #GDBusProxyTypeFunc function or %NULL to always construct #GDBusProxy proxies.
  * @get_proxy_type_user_data: User data to pass to @get_proxy_type_func.
- * @get_proxy_type_destroy_notify: (allow-none): Free function for @get_proxy_type_user_data or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL
+ * @get_proxy_type_destroy_notify: (nullable): Free function for @get_proxy_type_user_data or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL
  * @error: Return location for error or %NULL.
  *
  * Creates a new #GDBusObjectManagerClient object.
@@ -19744,7 +19760,7 @@
 /**
  * g_dbus_object_manager_server_set_connection:
  * @manager: A #GDBusObjectManagerServer.
- * @connection: (allow-none): A #GDBusConnection or %NULL.
+ * @connection: (nullable): A #GDBusConnection or %NULL.
  *
  * Exports all objects managed by @manager on @connection. If
  * @connection is %NULL, stops exporting objects.
@@ -19896,12 +19912,12 @@
  * g_dbus_proxy_call:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: (allow-none): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
+ * @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
  *                "infinite") or -1 to use the proxy default timeout.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
- * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: (nullable): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
  * care about the result of the method invocation.
  * @user_data: The data to pass to @callback.
  *
@@ -19970,12 +19986,12 @@
  * g_dbus_proxy_call_sync:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: (allow-none): A #GVariant tuple with parameters for the signal
+ * @parameters: (nullable): A #GVariant tuple with parameters for the signal
  *              or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
  *                "infinite") or -1 to use the proxy default timeout.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Synchronously invokes the @method_name method on @proxy.
@@ -20023,13 +20039,13 @@
  * g_dbus_proxy_call_with_unix_fd_list:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: (allow-none): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
+ * @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
  *                "infinite") or -1 to use the proxy default timeout.
- * @fd_list: (allow-none): A #GUnixFDList or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
- * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
+ * @fd_list: (nullable): A #GUnixFDList or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @callback: (nullable): A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
  * care about the result of the method invocation.
  * @user_data: The data to pass to @callback.
  *
@@ -20044,7 +20060,7 @@
 /**
  * g_dbus_proxy_call_with_unix_fd_list_finish:
  * @proxy: A #GDBusProxy.
- * @out_fd_list: (out) (allow-none): Return location for a #GUnixFDList or %NULL.
+ * @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL.
  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_proxy_call_with_unix_fd_list().
  * @error: Return location for error or %NULL.
  *
@@ -20060,14 +20076,14 @@
  * g_dbus_proxy_call_with_unix_fd_list_sync:
  * @proxy: A #GDBusProxy.
  * @method_name: Name of method to invoke.
- * @parameters: (allow-none): A #GVariant tuple with parameters for the signal
+ * @parameters: (nullable): A #GVariant tuple with parameters for the signal
  *              or %NULL if not passing parameters.
  * @flags: Flags from the #GDBusCallFlags enumeration.
  * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning
  *                "infinite") or -1 to use the proxy default timeout.
- * @fd_list: (allow-none): A #GUnixFDList or %NULL.
- * @out_fd_list: (out) (allow-none): Return location for a #GUnixFDList or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @fd_list: (nullable): A #GUnixFDList or %NULL.
+ * @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Like g_dbus_proxy_call_sync() but also takes and returns #GUnixFDList objects.
@@ -20214,11 +20230,11 @@
  * g_dbus_proxy_new:
  * @connection: A #GDBusConnection.
  * @flags: Flags used when constructing the proxy.
- * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
- * @name: (allow-none): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
+ * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @callback: Callback function to invoke when the proxy is ready.
  * @user_data: User data to pass to @callback.
  *
@@ -20266,11 +20282,11 @@
  * g_dbus_proxy_new_for_bus:
  * @bus_type: A #GBusType.
  * @flags: Flags used when constructing the proxy.
- * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
  * @name: A bus name (well-known or unique).
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @callback: Callback function to invoke when the proxy is ready.
  * @user_data: User data to pass to @callback.
  *
@@ -20298,12 +20314,12 @@
  * g_dbus_proxy_new_for_bus_sync:
  * @bus_type: A #GBusType.
  * @flags: Flags used when constructing the proxy.
- * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface
+ * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface
  *        that @proxy conforms to or %NULL.
  * @name: A bus name (well-known or unique).
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Like g_dbus_proxy_new_sync() but takes a #GBusType instead of a #GDBusConnection.
@@ -20319,12 +20335,12 @@
  * g_dbus_proxy_new_sync:
  * @connection: A #GDBusConnection.
  * @flags: Flags used when constructing the proxy.
- * @info: (allow-none): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
- * @name: (allow-none): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
+ * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL.
+ * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
  * @object_path: An object path.
  * @interface_name: A D-Bus interface name.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
- * @error: (allow-none): Return location for error or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
+ * @error: (nullable): Return location for error or %NULL.
  *
  * Creates a proxy for accessing @interface_name on the remote object
  * at @object_path owned by @name at @connection and synchronously
@@ -20354,7 +20370,7 @@
  * g_dbus_proxy_set_cached_property:
  * @proxy: A #GDBusProxy
  * @property_name: Property name.
- * @value: (allow-none): Value for the property or %NULL to remove it from the cache.
+ * @value: (nullable): Value for the property or %NULL to remove it from the cache.
  *
  * If @value is not %NULL, sets the cached value for the property with
  * name @property_name to the value in @value.
@@ -20412,7 +20428,7 @@
 /**
  * g_dbus_proxy_set_interface_info:
  * @proxy: A #GDBusProxy
- * @info: (allow-none): Minimum interface this proxy conforms to or %NULL to unset.
+ * @info: (nullable): Minimum interface this proxy conforms to or %NULL to unset.
  *
  * Ensure that interactions with @proxy conform to the given
  * interface. See the #GDBusProxy:g-interface-info property for more
@@ -20473,8 +20489,8 @@
  * @address: A D-Bus address.
  * @flags: Flags from the #GDBusServerFlags enumeration.
  * @guid: A D-Bus GUID.
- * @observer: (allow-none): A #GDBusAuthObserver or %NULL.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @observer: (nullable): A #GDBusAuthObserver or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for server or %NULL.
  *
  * Creates a new D-Bus server that listens on the first address in
@@ -20732,7 +20748,7 @@
  * @info: a #GDesktopAppInfo
  * @action_name: the name of the action as from
  *   g_desktop_app_info_list_actions()
- * @launch_context: (allow-none): a #GAppLaunchContext
+ * @launch_context: (nullable): a #GAppLaunchContext
  *
  * Activates the named application action.
  *
@@ -20758,13 +20774,13 @@
  * g_desktop_app_info_launch_uris_as_manager:
  * @appinfo: a #GDesktopAppInfo
  * @uris: (element-type utf8): List of URIs
- * @launch_context: (allow-none): a #GAppLaunchContext
+ * @launch_context: (nullable): a #GAppLaunchContext
  * @spawn_flags: #GSpawnFlags, used for each process
- * @user_setup: (scope call) (allow-none): a #GSpawnChildSetupFunc, used once
+ * @user_setup: (scope call) (nullable): a #GSpawnChildSetupFunc, used once
  *     for each process.
- * @user_setup_data: (closure user_setup) (allow-none): User data for @user_setup
- * @pid_callback: (scope call) (allow-none): Callback for child processes
- * @pid_callback_data: (closure pid_callback) (allow-none): User data for @callback
+ * @user_setup_data: (closure user_setup) (nullable): User data for @user_setup
+ * @pid_callback: (scope call) (nullable): Callback for child processes
+ * @pid_callback_data: (closure pid_callback) (nullable): User data for @callback
  * @error: return location for a #GError, or %NULL
  *
  * This function performs the equivalent of g_app_info_launch_uris(),
@@ -20956,8 +20972,8 @@
  * g_drive_eject:
  * @drive: a #GDrive.
  * @flags: flags affecting the unmount if required for eject
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data to pass to @callback
  *
  * Asynchronously ejects a drive.
@@ -20988,10 +21004,10 @@
  * g_drive_eject_with_operation:
  * @drive: a #GDrive.
  * @flags: flags affecting the unmount if required for eject
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Ejects a drive. This is an asynchronous operation, and is
@@ -21171,8 +21187,8 @@
 /**
  * g_drive_poll_for_media:
  * @drive: a #GDrive.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data to pass to @callback
  *
  * Asynchronously polls @drive to see if media has been inserted or removed.
@@ -21200,10 +21216,10 @@
  * g_drive_start:
  * @drive: a #GDrive.
  * @flags: flags affecting the start operation.
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data to pass to @callback
  *
  * Asynchronously starts a drive.
@@ -21234,10 +21250,10 @@
  * g_drive_stop:
  * @drive: a #GDrive.
  * @flags: flags affecting the unmount if required for stopping.
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data to pass to @callback
  *
  * Asynchronously stops a drive.
@@ -21310,7 +21326,7 @@
 /**
  * g_dtls_client_connection_new:
  * @base_socket: the #GDatagramBased to wrap
- * @server_identity: (allow-none): the expected identity of the server
+ * @server_identity: (nullable): the expected identity of the server
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Creates a new #GDtlsClientConnection wrapping @base_socket which is
@@ -21516,7 +21532,7 @@
 /**
  * g_dtls_connection_handshake:
  * @conn: a #GDtlsConnection
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a #GError, or %NULL
  *
  * Attempts a TLS handshake on @conn.
@@ -21551,7 +21567,7 @@
  * g_dtls_connection_handshake_async:
  * @conn: a #GDtlsConnection
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the handshake is complete
  * @user_data: the data to pass to the callback function
  *
@@ -21626,7 +21642,7 @@
 /**
  * g_dtls_connection_set_interaction:
  * @conn: a connection
- * @interaction: (allow-none): an interaction object, or %NULL
+ * @interaction: (nullable): an interaction object, or %NULL
  *
  * Set the object that will be used to interact with the user. It will be used
  * for things like prompting the user for passwords.
@@ -21769,7 +21785,7 @@
 /**
  * g_dtls_server_connection_new:
  * @base_socket: the #GDatagramBased to wrap
- * @certificate: (allow-none): the default server certificate, or %NULL
+ * @certificate: (nullable): the default server certificate, or %NULL
  * @error: #GError for error reporting, or %NULL to ignore
  *
  * Creates a new #GDtlsServerConnection wrapping @base_socket.
@@ -21873,7 +21889,7 @@
 /**
  * g_emblemed_icon_new:
  * @icon: a #GIcon
- * @emblem: (allow-none): a #GEmblem, or %NULL
+ * @emblem: (nullable): a #GEmblem, or %NULL
  *
  * Creates a new emblemed icon for @icon with the emblem @emblem.
  *
@@ -21886,7 +21902,7 @@
  * g_file_append_to:
  * @file: input #GFile
  * @flags: a set of #GFileCreateFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -21918,7 +21934,7 @@
  * @file: input #GFile
  * @flags: a set of #GFileCreateFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -22124,7 +22140,7 @@
 
 /**
  * g_file_attribute_matcher_to_string:
- * @matcher: (allow-none): a #GFileAttributeMatcher.
+ * @matcher: (nullable): a #GFileAttributeMatcher.
  *
  * Prints what the matcher is matching against. The format will be
  * equal to the format passed to g_file_attribute_matcher_new().
@@ -22170,9 +22186,9 @@
  * @source: input #GFile
  * @destination: destination #GFile
  * @flags: set of #GFileCopyFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @progress_callback: (allow-none) (scope call): function to callback with
+ * @progress_callback: (nullable) (scope call): function to callback with
  *     progress information, or %NULL if progress information is not needed
  * @progress_callback_data: (closure): user data to pass to @progress_callback
  * @error: #GError to set on error, or %NULL
@@ -22224,9 +22240,9 @@
  * @destination: destination #GFile
  * @flags: set of #GFileCopyFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @progress_callback: (allow-none): function to callback with progress
+ * @progress_callback: (nullable): function to callback with progress
  *     information, or %NULL if progress information is not needed
  * @progress_callback_data: (closure): user data to pass to @progress_callback
  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
@@ -22250,7 +22266,7 @@
  * @source: a #GFile with attributes
  * @destination: a #GFile to copy attributes to
  * @flags: a set of #GFileCopyFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, %NULL to ignore
  *
@@ -22284,7 +22300,7 @@
  * g_file_create:
  * @file: input #GFile
  * @flags: a set of #GFileCreateFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -22319,7 +22335,7 @@
  * @file: input #GFile
  * @flags: a set of #GFileCreateFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -22355,7 +22371,7 @@
  * g_file_create_readwrite:
  * @file: a #GFile
  * @flags: a set of #GFileCreateFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: return location for a #GError, or %NULL
  *
@@ -22395,7 +22411,7 @@
  * @file: input #GFile
  * @flags: a set of #GFileCreateFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -22433,7 +22449,7 @@
 /**
  * g_file_delete: (virtual delete_file)
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -22452,7 +22468,7 @@
  * g_file_delete_async: (virtual delete_file_async)
  * @file: input #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -22509,9 +22525,9 @@
  * g_file_eject_mountable:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (scope async) (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (scope async) (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: (closure): the data to pass to callback function
  *
@@ -22548,11 +22564,11 @@
  * g_file_eject_mountable_with_operation:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation,
+ * @mount_operation: (nullable): a #GMountOperation,
  *     or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (scope async) (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (scope async) (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: (closure): the data to pass to callback function
  *
@@ -22589,7 +22605,7 @@
  * @file: input #GFile
  * @attributes: an attribute query string
  * @flags: a set of #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: #GError for error reporting
  *
@@ -22628,7 +22644,7 @@
  * @attributes: an attribute query string
  * @flags: a set of #GFileQueryInfoFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call when the
  *     request is satisfied
@@ -22665,7 +22681,7 @@
 /**
  * g_file_enumerator_close:
  * @enumerator: a #GFileEnumerator.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Releases all resources used by this enumerator, making the
@@ -22683,7 +22699,7 @@
  * g_file_enumerator_close_async:
  * @enumerator: a #GFileEnumerator.
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -22774,8 +22790,8 @@
 /**
  * g_file_enumerator_iterate:
  * @direnum: an open #GFileEnumerator
- * @out_info: (out) (transfer none) (allow-none): Output location for the next #GFileInfo, or %NULL
- * @out_child: (out) (transfer none) (allow-none): Output location for the next #GFile, or %NULL
+ * @out_info: (out) (transfer none) (optional): Output location for the next #GFileInfo, or %NULL
+ * @out_child: (out) (transfer none) (optional): Output location for the next #GFile, or %NULL
  * @cancellable: a #GCancellable
  * @error: a #GError
  *
@@ -22825,7 +22841,7 @@
 /**
  * g_file_enumerator_next_file:
  * @enumerator: a #GFileEnumerator.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Returns information for the next file in the enumerated object.
@@ -22851,7 +22867,7 @@
  * @enumerator: a #GFileEnumerator.
  * @num_files: the number of file info objects to request
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -22921,7 +22937,7 @@
 /**
  * g_file_find_enclosing_mount:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError
  *
@@ -22945,7 +22961,7 @@
  * g_file_find_enclosing_mount_async:
  * @file: a #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -23147,7 +23163,7 @@
 /**
  * g_file_has_parent:
  * @file: input #GFile
- * @parent: (allow-none): the parent to check for, or %NULL
+ * @parent: (nullable): the parent to check for, or %NULL
  *
  * Checks if @file has a parent, and optionally, if it is @parent.
  *
@@ -23946,7 +23962,7 @@
  * g_file_input_stream_query_info:
  * @stream: a #GFileInputStream.
  * @attributes: a file attribute query string.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -23965,7 +23981,7 @@
  * @stream: a #GFileInputStream.
  * @attributes: a file attribute query string.
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -24013,7 +24029,7 @@
  * g_file_io_stream_query_info:
  * @stream: a #GFileIOStream.
  * @attributes: a file attribute query string.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Queries a file io stream for the given @attributes.
@@ -24044,7 +24060,7 @@
  * @stream: a #GFileIOStream.
  * @attributes: a file attribute query string.
  * @io_priority: the [I/O priority][gio-GIOScheduler] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -24098,9 +24114,9 @@
  * @file: input #GFile
  * @cancellable: optional #GCancellable object, %NULL to ignore
  * @contents: (out) (transfer full) (element-type guint8) (array length=length): a location to place the contents of the file
- * @length: (out) (allow-none): a location to place the length of the contents of the file,
+ * @length: (out) (optional): a location to place the length of the contents of the file,
  *    or %NULL if the length is not needed
- * @etag_out: (out) (allow-none): a location to place the current entity tag for the file,
+ * @etag_out: (out) (optional): a location to place the current entity tag for the file,
  *    or %NULL if the entity tag is not needed
  * @error: a #GError, or %NULL
  *
@@ -24146,9 +24162,9 @@
  * @file: input #GFile
  * @res: a #GAsyncResult
  * @contents: (out) (transfer full) (element-type guint8) (array length=length): a location to place the contents of the file
- * @length: (out) (allow-none): a location to place the length of the contents of the file,
+ * @length: (out) (optional): a location to place the length of the contents of the file,
  *     or %NULL if the length is not needed
- * @etag_out: (out) (allow-none): a location to place the current entity tag for the file,
+ * @etag_out: (out) (optional): a location to place the current entity tag for the file,
  *     or %NULL if the entity tag is not needed
  * @error: a #GError, or %NULL
  *
@@ -24191,9 +24207,9 @@
  * @file: input #GFile
  * @res: a #GAsyncResult
  * @contents: (out) (transfer full) (element-type guint8) (array length=length): a location to place the contents of the file
- * @length: (out) (allow-none): a location to place the length of the contents of the file,
+ * @length: (out) (optional): a location to place the length of the contents of the file,
  *     or %NULL if the length is not needed
- * @etag_out: (out) (allow-none): a location to place the current entity tag for the file,
+ * @etag_out: (out) (optional): a location to place the current entity tag for the file,
  *     or %NULL if the entity tag is not needed
  * @error: a #GError, or %NULL
  *
@@ -24211,7 +24227,7 @@
 /**
  * g_file_make_directory:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -24238,7 +24254,7 @@
  * g_file_make_directory_async: (virtual make_directory_async)
  * @file: input #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -24267,7 +24283,7 @@
 /**
  * g_file_make_directory_with_parents:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -24296,7 +24312,7 @@
  * @file: a #GFile with the name of the symlink to create
  * @symlink_value: (type filename): a string with the path for the target
  *     of the new symlink
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError
  *
@@ -24315,13 +24331,13 @@
  * g_file_measure_disk_usage:
  * @file: a #GFile
  * @flags: #GFileMeasureFlags
- * @cancellable: (allow-none): optional #GCancellable
- * @progress_callback: (allow-none): a #GFileMeasureProgressCallback
+ * @cancellable: (nullable): optional #GCancellable
+ * @progress_callback: (nullable): a #GFileMeasureProgressCallback
  * @progress_data: user_data for @progress_callback
- * @disk_usage: (allow-none) (out): the number of bytes of disk space used
- * @num_dirs: (allow-none) (out): the number of directories encountered
- * @num_files: (allow-none) (out): the number of non-directories encountered
- * @error: (allow-none): %NULL, or a pointer to a %NULL #GError pointer
+ * @disk_usage: (out) (optional): the number of bytes of disk space used
+ * @num_dirs: (out) (optional): the number of directories encountered
+ * @num_files: (out) (optional): the number of non-directories encountered
+ * @error: (nullable): %NULL, or a pointer to a %NULL #GError pointer
  *
  * Recursively measures the disk usage of @file.
  *
@@ -24353,10 +24369,10 @@
  * @file: a #GFile
  * @flags: #GFileMeasureFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable
- * @progress_callback: (allow-none): a #GFileMeasureProgressCallback
+ * @cancellable: (nullable): optional #GCancellable
+ * @progress_callback: (nullable): a #GFileMeasureProgressCallback
  * @progress_data: user_data for @progress_callback
- * @callback: (allow-none): a #GAsyncReadyCallback to call when complete
+ * @callback: (nullable): a #GAsyncReadyCallback to call when complete
  * @user_data: the data to pass to callback function
  *
  * Recursively measures the disk usage of @file.
@@ -24372,10 +24388,10 @@
  * g_file_measure_disk_usage_finish:
  * @file: a #GFile
  * @result: the #GAsyncResult passed to your #GAsyncReadyCallback
- * @disk_usage: (allow-none) (out): the number of bytes of disk space used
- * @num_dirs: (allow-none) (out): the number of directories encountered
- * @num_files: (allow-none) (out): the number of non-directories encountered
- * @error: (allow-none): %NULL, or a pointer to a %NULL #GError pointer
+ * @disk_usage: (out) (optional): the number of bytes of disk space used
+ * @num_dirs: (out) (optional): the number of directories encountered
+ * @num_files: (out) (optional): the number of non-directories encountered
+ * @error: (nullable): %NULL, or a pointer to a %NULL #GError pointer
  *
  * Collects the results from an earlier call to
  * g_file_measure_disk_usage_async().  See g_file_measure_disk_usage() for
@@ -24391,7 +24407,7 @@
  * g_file_monitor:
  * @file: input #GFile
  * @flags: a set of #GFileMonitorFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -24423,7 +24439,7 @@
  * g_file_monitor_directory: (virtual monitor_dir)
  * @file: input #GFile
  * @flags: a set of #GFileMonitorFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -24467,7 +24483,7 @@
  * g_file_monitor_file:
  * @file: input #GFile
  * @flags: a set of #GFileMonitorFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -24517,11 +24533,11 @@
  * g_file_mount_enclosing_volume:
  * @location: input #GFile
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation
+ * @mount_operation: (nullable): a #GMountOperation
  *     or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: the data to pass to callback function
  *
@@ -24556,11 +24572,11 @@
  * g_file_mount_mountable:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation,
+ * @mount_operation: (nullable): a #GMountOperation,
  *     or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (scope async) (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (scope async) (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: (closure): the data to pass to callback function
  *
@@ -24599,9 +24615,9 @@
  * @source: #GFile pointing to the source location
  * @destination: #GFile pointing to the destination location
  * @flags: set of #GFileCopyFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @progress_callback: (allow-none) (scope call): #GFileProgressCallback
+ * @progress_callback: (nullable) (scope call): #GFileProgressCallback
  *     function for updates
  * @progress_callback_data: (closure): gpointer to user data for
  *     the callback function
@@ -24725,7 +24741,7 @@
 
 /**
  * g_file_new_tmp:
- * @tmpl: (type filename) (allow-none): Template for the file
+ * @tmpl: (type filename) (nullable): Template for the file
  *   name, as in g_file_open_tmp(), or %NULL for a default template
  * @iostream: (out): on return, a #GFileIOStream for the created file
  * @error: a #GError, or %NULL
@@ -24750,7 +24766,7 @@
 /**
  * g_file_open_readwrite:
  * @file: #GFile to open
- * @cancellable: (allow-none): a #GCancellable
+ * @cancellable: (nullable): a #GCancellable
  * @error: a #GError, or %NULL
  *
  * Opens an existing file for reading and writing. The result is
@@ -24780,7 +24796,7 @@
  * g_file_open_readwrite_async:
  * @file: input #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -24903,7 +24919,7 @@
  * g_file_poll_mountable:
  * @file: input #GFile
  * @cancellable: optional #GCancellable object, %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: the data to pass to callback function
  *
@@ -24960,7 +24976,7 @@
 /**
  * g_file_query_exists:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  *
  * Utility function to check if a particular file exists. This is
@@ -24995,7 +25011,7 @@
  * g_file_query_file_type:
  * @file: input #GFile
  * @flags: a set of #GFileQueryInfoFlags passed to g_file_query_info()
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  *
  * Utility function to inspect the #GFileType of a file. This is
@@ -25014,7 +25030,7 @@
  * g_file_query_filesystem_info:
  * @file: input #GFile
  * @attributes: an attribute query string
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError
  *
@@ -25054,7 +25070,7 @@
  * @file: input #GFile
  * @attributes: an attribute query string
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -25094,7 +25110,7 @@
  * @file: input #GFile
  * @attributes: an attribute query string
  * @flags: a set of #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError
  *
@@ -25140,7 +25156,7 @@
  * @attributes: an attribute query string
  * @flags: a set of #GFileQueryInfoFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call when the
  *     request is satisfied
@@ -25176,7 +25192,7 @@
 /**
  * g_file_query_settable_attributes:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25200,7 +25216,7 @@
 /**
  * g_file_query_writable_namespaces:
  * @file: input #GFile
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25221,7 +25237,7 @@
 /**
  * g_file_read: (virtual read_fn)
  * @file: #GFile to read
- * @cancellable: (allow-none): a #GCancellable
+ * @cancellable: (nullable): a #GCancellable
  * @error: a #GError, or %NULL
  *
  * Opens a file for reading. The result is a #GFileInputStream that
@@ -25245,7 +25261,7 @@
  * g_file_read_async:
  * @file: input #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -25279,11 +25295,11 @@
 /**
  * g_file_replace:
  * @file: input #GFile
- * @etag: (allow-none): an optional [entity tag][gfile-etag]
+ * @etag: (nullable): an optional [entity tag][gfile-etag]
  *     for the current #GFile, or #NULL to ignore
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25337,12 +25353,12 @@
 /**
  * g_file_replace_async:
  * @file: input #GFile
- * @etag: (allow-none): an [entity tag][gfile-etag] for the current #GFile,
+ * @etag: (nullable): an [entity tag][gfile-etag] for the current #GFile,
  *     or %NULL to ignore
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -25365,11 +25381,11 @@
  * @file: input #GFile
  * @contents: (element-type guint8) (array length=length): a string containing the new contents for @file
  * @length: the length of @contents in bytes
- * @etag: (allow-none): the old [entity-tag][gfile-etag] for the document,
+ * @etag: (nullable): the old [entity-tag][gfile-etag] for the document,
  *     or %NULL
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
- * @new_etag: (allow-none) (out): a location to a new [entity tag][gfile-etag]
+ * @new_etag: (out) (optional): a location to a new [entity tag][gfile-etag]
  *      for the document. This should be freed with g_free() when no longer
  *      needed, or %NULL
  * @cancellable: optional #GCancellable object, %NULL to ignore
@@ -25402,7 +25418,7 @@
  * @file: input #GFile
  * @contents: (element-type guint8) (array length=length): string of contents to replace the file with
  * @length: the length of @contents in bytes
- * @etag: (allow-none): a new [entity tag][gfile-etag] for the @file, or %NULL
+ * @etag: (nullable): a new [entity tag][gfile-etag] for the @file, or %NULL
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
  * @cancellable: optional #GCancellable object, %NULL to ignore
@@ -25435,7 +25451,7 @@
  * g_file_replace_contents_bytes_async:
  * @file: input #GFile
  * @contents: a #GBytes
- * @etag: (allow-none): a new [entity tag][gfile-etag] for the @file, or %NULL
+ * @etag: (nullable): a new [entity tag][gfile-etag] for the @file, or %NULL
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
  * @cancellable: optional #GCancellable object, %NULL to ignore
@@ -25459,7 +25475,7 @@
  * g_file_replace_contents_finish:
  * @file: input #GFile
  * @res: a #GAsyncResult
- * @new_etag: (out) (allow-none): a location of a new [entity tag][gfile-etag]
+ * @new_etag: (out) (optional): a location of a new [entity tag][gfile-etag]
  *     for the document. This should be freed with g_free() when it is no
  *     longer needed, or %NULL
  * @error: a #GError, or %NULL
@@ -25489,11 +25505,11 @@
 /**
  * g_file_replace_readwrite:
  * @file: a #GFile
- * @etag: (allow-none): an optional [entity tag][gfile-etag]
+ * @etag: (nullable): an optional [entity tag][gfile-etag]
  *     for the current #GFile, or #NULL to ignore
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: return location for a #GError, or %NULL
  *
@@ -25517,12 +25533,12 @@
 /**
  * g_file_replace_readwrite_async:
  * @file: input #GFile
- * @etag: (allow-none): an [entity tag][gfile-etag] for the current #GFile,
+ * @etag: (nullable): an [entity tag][gfile-etag] for the current #GFile,
  *     or %NULL to ignore
  * @make_backup: %TRUE if a backup should be created
  * @flags: a set of #GFileCreateFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -25578,10 +25594,10 @@
  * @file: input #GFile
  * @attribute: a string containing the attribute's name
  * @type: The type of the attribute
- * @value_p: (allow-none): a pointer to the value (or the pointer
+ * @value_p: (nullable): a pointer to the value (or the pointer
  *     itself if the type is a pointer type)
  * @flags: a set of #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25604,7 +25620,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a string containing the attribute's new value
  * @flags: a #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25627,7 +25643,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a #gint32 containing the attribute's new value
  * @flags: a #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25649,7 +25665,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a #guint64 containing the attribute's new value
  * @flags: a #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25670,7 +25686,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a string containing the attribute's value
  * @flags: #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25691,7 +25707,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a #guint32 containing the attribute's new value
  * @flags: a #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25713,7 +25729,7 @@
  * @attribute: a string containing the attribute's name
  * @value: a #guint64 containing the attribute's new value
  * @flags: a #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25735,7 +25751,7 @@
  * @info: a #GFileInfo
  * @flags: a #GFileQueryInfoFlags
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): a #gpointer
@@ -25769,7 +25785,7 @@
  * @file: input #GFile
  * @info: a #GFileInfo
  * @flags: #GFileQueryInfoFlags
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25794,7 +25810,7 @@
  * g_file_set_display_name:
  * @file: input #GFile
  * @display_name: a string
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25825,7 +25841,7 @@
  * @file: input #GFile
  * @display_name: a string
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: (scope async): a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -25860,9 +25876,9 @@
  * g_file_start_mountable:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @start_operation: (allow-none): a #GMountOperation, or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback to call when the request is satisfied, or %NULL
+ * @start_operation: (nullable): a #GMountOperation, or %NULL to avoid user interaction
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
+ * @callback: (nullable): a #GAsyncReadyCallback to call when the request is satisfied, or %NULL
  * @user_data: the data to pass to callback function
  *
  * Starts a file of type #G_FILE_TYPE_MOUNTABLE.
@@ -25902,11 +25918,11 @@
  * g_file_stop_mountable:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation,
+ * @mount_operation: (nullable): a #GMountOperation,
  *     or %NULL to avoid user interaction.
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: the data to pass to callback function
  *
@@ -25958,7 +25974,7 @@
 /**
  * g_file_trash: (virtual trash)
  * @file: #GFile to send to trash
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @error: a #GError, or %NULL
  *
@@ -25979,7 +25995,7 @@
  * g_file_trash_async: (virtual trash_async)
  * @file: input #GFile
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
  * @callback: a #GAsyncReadyCallback to call
  *     when the request is satisfied
@@ -26009,9 +26025,9 @@
  * g_file_unmount_mountable:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (scope async) (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (scope async) (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: (closure): the data to pass to callback function
  *
@@ -26051,11 +26067,11 @@
  * g_file_unmount_mountable_with_operation:
  * @file: input #GFile
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation,
+ * @mount_operation: (nullable): a #GMountOperation,
  *     or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object,
+ * @cancellable: (nullable): optional #GCancellable object,
  *     %NULL to ignore
- * @callback: (scope async) (allow-none): a #GAsyncReadyCallback to call
+ * @callback: (scope async) (nullable): a #GAsyncReadyCallback to call
  *     when the request is satisfied, or %NULL
  * @user_data: (closure): the data to pass to callback function
  *
@@ -26208,8 +26224,8 @@
 
 /**
  * g_icon_equal:
- * @icon1: (allow-none): pointer to the first #GIcon.
- * @icon2: (allow-none): pointer to the second #GIcon.
+ * @icon1: (nullable): pointer to the first #GIcon.
+ * @icon2: (nullable): pointer to the second #GIcon.
  *
  * Checks if two icons are equal.
  *
@@ -26734,7 +26750,7 @@
  * @cancellable: optional #GCancellable object, %NULL to ignore.
  * @error: a #GError location to store the error occurring, or %NULL to
  *    ignore.
- * @first_property_name: (allow-none): the name of the first property, or %NULL if no
+ * @first_property_name: (nullable): the name of the first property, or %NULL if no
  *     properties
  * @...: the value if the first property, followed by and other property
  *    value pairs, and ended by %NULL.
@@ -26799,7 +26815,7 @@
 /**
  * g_input_stream_close:
  * @stream: A #GInputStream.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Closes the stream, releasing resources related to it.
@@ -26834,7 +26850,7 @@
  * g_input_stream_close_async:
  * @stream: A #GInputStream.
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -26890,7 +26906,7 @@
  * @buffer: (array length=count) (element-type guint8): a buffer to
  *     read data into (which should be at least count bytes long).
  * @count: the number of bytes that will be read from the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to read @count bytes from the stream into the buffer starting at
@@ -26926,7 +26942,7 @@
  *     read data into (which should be at least count bytes long).
  * @count: the number of bytes that will be read from the stream
  * @bytes_read: (out): location to store the number of bytes that was read from the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to read @count bytes from the stream into the buffer starting at
@@ -26960,7 +26976,7 @@
  *     read data into (which should be at least count bytes long)
  * @count: the number of bytes that will be read from the stream
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -27009,7 +27025,7 @@
  * @count: the number of bytes that will be read from the stream
  * @io_priority: the [I/O priority][io-priority]
  * of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -27044,7 +27060,7 @@
  * @stream: a #GInputStream.
  * @count: maximum number of bytes that will be read from the stream. Common
  * values include 4096 and 8192.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Like g_input_stream_read(), this tries to read @count bytes from
@@ -27081,7 +27097,7 @@
  * @stream: A #GInputStream.
  * @count: the number of bytes that will be read from the stream
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -27155,7 +27171,7 @@
  * g_input_stream_skip:
  * @stream: a #GInputStream.
  * @count: the number of bytes that will be skipped from the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to skip @count bytes from the stream. Will block during the operation.
@@ -27182,7 +27198,7 @@
  * @stream: A #GInputStream.
  * @count: the number of bytes that will be skipped from the stream
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -27550,7 +27566,7 @@
  * @job: a #GIOSchedulerJob
  * @func: a #GSourceFunc callback that will be called in the original thread
  * @user_data: data to pass to @func
- * @notify: (allow-none): a #GDestroyNotify for @user_data, or %NULL
+ * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
  *
  * Used from an I/O job to send a callback to be run in the thread
  * that the job was started from, waiting for the result (and thus
@@ -27566,7 +27582,7 @@
  * @job: a #GIOSchedulerJob
  * @func: a #GSourceFunc callback that will be called in the original thread
  * @user_data: data to pass to @func
- * @notify: (allow-none): a #GDestroyNotify for @user_data, or %NULL
+ * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
  *
  * Used from an I/O job to send a callback to be run asynchronously in
  * the thread that the job was started from. The callback will be run
@@ -27586,7 +27602,7 @@
  * g_io_scheduler_push_job:
  * @job_func: a #GIOSchedulerJobFunc.
  * @user_data: data to pass to @job_func
- * @notify: (allow-none): a #GDestroyNotify for @user_data, or %NULL
+ * @notify: (nullable): a #GDestroyNotify for @user_data, or %NULL
  * @io_priority: the [I/O priority][io-priority]
  * of the request.
  * @cancellable: optional #GCancellable object, %NULL to ignore.
@@ -27617,7 +27633,7 @@
 /**
  * g_io_stream_close:
  * @stream: a #GIOStream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Closes the stream, releasing resources related to it. This will also
@@ -27663,7 +27679,7 @@
  * g_io_stream_close_async:
  * @stream: a #GIOStream
  * @io_priority: the io priority of the request
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -27765,7 +27781,7 @@
  * @stream2: a #GIOStream.
  * @flags: a set of #GIOStreamSpliceFlags.
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  *
@@ -27798,7 +27814,7 @@
  * g_keyfile_settings_backend_new:
  * @filename: the filename of the keyfile
  * @root_path: the path under which all settings keys appear
- * @root_group: (allow-none): the group name corresponding to
+ * @root_group: (nullable): the group name corresponding to
  *              @root_path, or %NULL
  *
  * Creates a keyfile-backed #GSettingsBackend.
@@ -28082,7 +28098,7 @@
  * @size: an integer.
  * @type: (out) (optional): a location to store the type of the loaded
  * icon, %NULL to ignore.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to
  * ignore.
  * @error: a #GError location to store the error occurring, or %NULL
  * to ignore.
@@ -28098,7 +28114,7 @@
  * g_loadable_icon_load_async:
  * @icon: a #GLoadableIcon.
  * @size: an integer.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the
  *            request is satisfied
  * @user_data: (closure): the data to pass to callback function
@@ -28149,7 +28165,7 @@
  * @stream: a #GMemoryInputStream
  * @data: (array length=len) (element-type guint8) (transfer full): input data
  * @len: length of the data, may be -1 if @data is a nul-terminated string
- * @destroy: (allow-none): function that is called to free @data, or %NULL
+ * @destroy: (nullable): function that is called to free @data, or %NULL
  *
  * Appends @data to data that can be read from the input stream
  */
@@ -28179,7 +28195,7 @@
  * g_memory_input_stream_new_from_data:
  * @data: (array length=len) (element-type guint8) (transfer full): input data
  * @len: length of the data, may be -1 if @data is a nul-terminated string
- * @destroy: (allow-none): function that is called to free @data, or %NULL
+ * @destroy: (nullable): function that is called to free @data, or %NULL
  *
  * Creates a new #GMemoryInputStream with data in memory of a given size.
  *
@@ -28239,11 +28255,11 @@
 
 /**
  * g_memory_output_stream_new: (skip)
- * @data: (allow-none): pointer to a chunk of memory to use, or %NULL
+ * @data: (nullable): pointer to a chunk of memory to use, or %NULL
  * @size: the size of @data
- * @realloc_function: (allow-none): a function with realloc() semantics (like g_realloc())
+ * @realloc_function: (nullable): a function with realloc() semantics (like g_realloc())
  *     to be called when @data needs to be grown, or %NULL
- * @destroy_function: (allow-none): a function to be called on @data when the stream is
+ * @destroy_function: (nullable): a function to be called on @data when the stream is
  *     finalized, or %NULL
  *
  * Creates a new #GMemoryOutputStream.
@@ -28348,8 +28364,8 @@
 /**
  * g_menu_append:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
- * @detailed_action: (allow-none): the detailed action string, or %NULL
+ * @label: (nullable): the section label, or %NULL
+ * @detailed_action: (nullable): the detailed action string, or %NULL
  *
  * Convenience function for appending a normal menu item to the end of
  * @menu.  Combine g_menu_item_new() and g_menu_insert_item() for a more
@@ -28375,7 +28391,7 @@
 /**
  * g_menu_append_section:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @section: a #GMenuModel with the items of the section
  *
  * Convenience function for appending a section menu item to the end of
@@ -28389,7 +28405,7 @@
 /**
  * g_menu_append_submenu:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @submenu: a #GMenuModel with the items of the submenu
  *
  * Convenience function for appending a submenu menu item to the end of
@@ -28417,8 +28433,8 @@
 /**
  * g_menu_attribute_iter_get_next:
  * @iter: a #GMenuAttributeIter
- * @out_name: (out) (allow-none) (transfer none): the type of the attribute
- * @value: (out) (allow-none) (transfer full): the attribute value
+ * @out_name: (out) (optional) (transfer none): the type of the attribute
+ * @value: (out) (optional) (transfer full): the attribute value
  *
  * This function combines g_menu_attribute_iter_next() with
  * g_menu_attribute_iter_get_name() and g_menu_attribute_iter_get_value().
@@ -28495,8 +28511,8 @@
  * g_menu_insert:
  * @menu: a #GMenu
  * @position: the position at which to insert the item
- * @label: (allow-none): the section label, or %NULL
- * @detailed_action: (allow-none): the detailed action string, or %NULL
+ * @label: (nullable): the section label, or %NULL
+ * @detailed_action: (nullable): the detailed action string, or %NULL
  *
  * Convenience function for inserting a normal menu item into @menu.
  * Combine g_menu_item_new() and g_menu_insert_item() for a more flexible
@@ -28538,7 +28554,7 @@
  * g_menu_insert_section:
  * @menu: a #GMenu
  * @position: the position at which to insert the item
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @section: a #GMenuModel with the items of the section
  *
  * Convenience function for inserting a section menu item into @menu.
@@ -28553,7 +28569,7 @@
  * g_menu_insert_submenu:
  * @menu: a #GMenu
  * @position: the position at which to insert the item
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @submenu: a #GMenuModel with the items of the submenu
  *
  * Convenience function for inserting a submenu menu item into @menu.
@@ -28591,7 +28607,7 @@
  * g_menu_item_get_attribute_value:
  * @menu_item: a #GMenuItem
  * @attribute: the attribute name to query
- * @expected_type: (allow-none): the expected type of the attribute
+ * @expected_type: (nullable): the expected type of the attribute
  *
  * Queries the named @attribute on @menu_item.
  *
@@ -28618,8 +28634,8 @@
 
 /**
  * g_menu_item_new:
- * @label: (allow-none): the section label, or %NULL
- * @detailed_action: (allow-none): the detailed action string, or %NULL
+ * @label: (nullable): the section label, or %NULL
+ * @detailed_action: (nullable): the detailed action string, or %NULL
  *
  * Creates a new #GMenuItem.
  *
@@ -28653,7 +28669,7 @@
 
 /**
  * g_menu_item_new_section:
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @section: a #GMenuModel with the items of the section
  *
  * Creates a new #GMenuItem representing a section.
@@ -28724,7 +28740,7 @@
 
 /**
  * g_menu_item_new_submenu:
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @submenu: a #GMenuModel with the items of the submenu
  *
  * Creates a new #GMenuItem representing a submenu.
@@ -28740,8 +28756,8 @@
 /**
  * g_menu_item_set_action_and_target:
  * @menu_item: a #GMenuItem
- * @action: (allow-none): the name of the action for this item
- * @format_string: (allow-none): a GVariant format string
+ * @action: (nullable): the name of the action for this item
+ * @format_string: (nullable): a GVariant format string
  * @...: positional parameters, as per @format_string
  *
  * Sets or unsets the "action" and "target" attributes of @menu_item.
@@ -28771,8 +28787,8 @@
 /**
  * g_menu_item_set_action_and_target_value:
  * @menu_item: a #GMenuItem
- * @action: (allow-none): the name of the action for this item
- * @target_value: (allow-none): a #GVariant to use as the action target
+ * @action: (nullable): the name of the action for this item
+ * @target_value: (nullable): a #GVariant to use as the action target
  *
  * Sets or unsets the "action" and "target" attributes of @menu_item.
  *
@@ -28819,7 +28835,7 @@
  * g_menu_item_set_attribute:
  * @menu_item: a #GMenuItem
  * @attribute: the attribute to set
- * @format_string: (allow-none): a #GVariant format string, or %NULL
+ * @format_string: (nullable): a #GVariant format string, or %NULL
  * @...: positional parameters, as per @format_string
  *
  * Sets or unsets an attribute on @menu_item.
@@ -28848,7 +28864,7 @@
  * g_menu_item_set_attribute_value:
  * @menu_item: a #GMenuItem
  * @attribute: the attribute to set
- * @value: (allow-none): a #GVariant to use as the value, or %NULL
+ * @value: (nullable): a #GVariant to use as the value, or %NULL
  *
  * Sets or unsets an attribute on @menu_item.
  *
@@ -28920,7 +28936,7 @@
 /**
  * g_menu_item_set_label:
  * @menu_item: a #GMenuItem
- * @label: (allow-none): the label to set, or %NULL to unset
+ * @label: (nullable): the label to set, or %NULL to unset
  *
  * Sets or unsets the "label" attribute of @menu_item.
  *
@@ -28935,7 +28951,7 @@
  * g_menu_item_set_link:
  * @menu_item: a #GMenuItem
  * @link: type of link to establish or unset
- * @model: (allow-none): the #GMenuModel to link to (or %NULL to unset)
+ * @model: (nullable): the #GMenuModel to link to (or %NULL to unset)
  *
  * Creates a link from @menu_item to @model if non-%NULL, or unsets it.
  *
@@ -28955,7 +28971,7 @@
 /**
  * g_menu_item_set_section:
  * @menu_item: a #GMenuItem
- * @section: (allow-none): a #GMenuModel, or %NULL
+ * @section: (nullable): a #GMenuModel, or %NULL
  *
  * Sets or unsets the "section" link of @menu_item to @section.
  *
@@ -28972,7 +28988,7 @@
 /**
  * g_menu_item_set_submenu:
  * @menu_item: a #GMenuItem
- * @submenu: (allow-none): a #GMenuModel, or %NULL
+ * @submenu: (nullable): a #GMenuModel, or %NULL
  *
  * Sets or unsets the "submenu" link of @menu_item to @submenu.
  *
@@ -29002,8 +29018,8 @@
 /**
  * g_menu_link_iter_get_next:
  * @iter: a #GMenuLinkIter
- * @out_link: (out) (allow-none) (transfer none): the name of the link
- * @value: (out) (allow-none) (transfer full): the linked #GMenuModel
+ * @out_link: (out) (optional) (transfer none): the name of the link
+ * @value: (out) (optional) (transfer full): the linked #GMenuModel
  *
  * This function combines g_menu_link_iter_next() with
  * g_menu_link_iter_get_name() and g_menu_link_iter_get_value().
@@ -29092,7 +29108,7 @@
  * @model: a #GMenuModel
  * @item_index: the index of the item
  * @attribute: the attribute to query
- * @expected_type: (allow-none): the expected type of the attribute, or
+ * @expected_type: (nullable): the expected type of the attribute, or
  *     %NULL
  *
  * Queries the item at position @item_index in @model for the attribute
@@ -29227,8 +29243,8 @@
 /**
  * g_menu_prepend:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
- * @detailed_action: (allow-none): the detailed action string, or %NULL
+ * @label: (nullable): the section label, or %NULL
+ * @detailed_action: (nullable): the detailed action string, or %NULL
  *
  * Convenience function for prepending a normal menu item to the start
  * of @menu.  Combine g_menu_item_new() and g_menu_insert_item() for a more
@@ -29254,7 +29270,7 @@
 /**
  * g_menu_prepend_section:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @section: a #GMenuModel with the items of the section
  *
  * Convenience function for prepending a section menu item to the start
@@ -29268,7 +29284,7 @@
 /**
  * g_menu_prepend_submenu:
  * @menu: a #GMenu
- * @label: (allow-none): the section label, or %NULL
+ * @label: (nullable): the section label, or %NULL
  * @submenu: a #GMenuModel with the items of the submenu
  *
  * Convenience function for prepending a submenu menu item to the start
@@ -29333,8 +29349,8 @@
  * g_mount_eject:
  * @mount: a #GMount.
  * @flags: flags affecting the unmount if required for eject
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Ejects a mount. This is an asynchronous operation, and is
@@ -29364,10 +29380,10 @@
  * g_mount_eject_with_operation:
  * @mount: a #GMount.
  * @flags: flags affecting the unmount if required for eject
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Ejects a mount. This is an asynchronous operation, and is
@@ -29514,7 +29530,7 @@
  * @mount: a #GMount
  * @force_rescan: Whether to force a rescan of the content.
  *     Otherwise a cached result will be used if available
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @callback: a #GAsyncReadyCallback
  * @user_data: user data passed to @callback
  *
@@ -29558,7 +29574,7 @@
  * @mount: a #GMount
  * @force_rescan: Whether to force a rescan of the content.
  *     Otherwise a cached result will be used if available
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @error: a #GError location to store the error occurring, or %NULL to
  *     ignore
  *
@@ -29749,10 +29765,10 @@
  * g_mount_remount:
  * @mount: a #GMount.
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Remounts a mount. This is an asynchronous operation, and is
@@ -29798,8 +29814,8 @@
  * g_mount_unmount:
  * @mount: a #GMount.
  * @flags: flags affecting the operation
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Unmounts a mount. This is an asynchronous operation, and is
@@ -29829,10 +29845,10 @@
  * g_mount_unmount_with_operation:
  * @mount: a #GMount.
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
  *     user interaction.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
  * @user_data: user data passed to @callback.
  *
  * Unmounts a mount. This is an asynchronous operation, and is
@@ -30048,7 +30064,7 @@
  * g_network_monitor_can_reach:
  * @monitor: a #GNetworkMonitor
  * @connectable: a #GSocketConnectable
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Attempts to determine whether or not the host pointed to by
@@ -30078,7 +30094,7 @@
  * g_network_monitor_can_reach_async:
  * @monitor: a #GNetworkMonitor
  * @connectable: a #GSocketConnectable
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback to call when the
  *     request is satisfied
  * @user_data: (closure): the data to pass to callback function
@@ -30282,7 +30298,7 @@
  * @notification: a #GNotification
  * @label: label of the button
  * @action: an action name
- * @target_format: (allow-none): a #GVariant format string, or %NULL
+ * @target_format: (nullable): a #GVariant format string, or %NULL
  * @...: positional parameters, as determined by @target_format
  *
  * Adds a button to @notification that activates @action when clicked.
@@ -30302,7 +30318,7 @@
  * @notification: a #GNotification
  * @label: label of the button
  * @action: an action name
- * @target: (allow-none): a #GVariant to use as @action's parameter, or %NULL
+ * @target: (nullable): a #GVariant to use as @action's parameter, or %NULL
  *
  * Adds a button to @notification that activates @action when clicked.
  * @action must be an application-wide action (it must start with "app.").
@@ -30333,7 +30349,7 @@
 /**
  * g_notification_set_body:
  * @notification: a #GNotification
- * @body: (allow-none): the new body for @notification, or %NULL
+ * @body: (nullable): the new body for @notification, or %NULL
  *
  * Sets the body of @notification to @body.
  *
@@ -30366,7 +30382,7 @@
  * g_notification_set_default_action_and_target: (skip)
  * @notification: a #GNotification
  * @action: an action name
- * @target_format: (allow-none): a #GVariant format string, or %NULL
+ * @target_format: (nullable): a #GVariant format string, or %NULL
  * @...: positional parameters, as determined by @target_format
  *
  * Sets the default action of @notification to @action. This action is
@@ -30389,7 +30405,7 @@
  * g_notification_set_default_action_and_target_value: (rename-to g_notification_set_default_action_and_target)
  * @notification: a #GNotification
  * @action: an action name
- * @target: (allow-none): a #GVariant to use as @action's parameter, or %NULL
+ * @target: (nullable): a #GVariant to use as @action's parameter, or %NULL
  *
  * Sets the default action of @notification to @action. This action is
  * activated when the notification is clicked on. It must be an
@@ -30472,7 +30488,7 @@
 /**
  * g_output_stream_close:
  * @stream: A #GOutputStream.
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Closes the stream, releasing resources related to it.
@@ -30513,7 +30529,7 @@
  * g_output_stream_close_async:
  * @stream: A #GOutputStream.
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -30546,7 +30562,7 @@
 /**
  * g_output_stream_flush:
  * @stream: a #GOutputStream.
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Forces a write of all user-space buffered data for the given
@@ -30567,7 +30583,7 @@
  * g_output_stream_flush_async:
  * @stream: a #GOutputStream.
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -30633,7 +30649,7 @@
  * @stream: a #GOutputStream.
  * @bytes_written: (out): location to store the number of bytes that was
  *     written to the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  * @format: the format string. See the printf() documentation
  * @...: the parameters to insert into the format string
@@ -30675,7 +30691,7 @@
  * @stream: a #GOutputStream.
  * @source: a #GInputStream.
  * @flags: a set of #GOutputStreamSpliceFlags.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -30695,7 +30711,7 @@
  * @source: a #GInputStream.
  * @flags: a set of #GOutputStreamSpliceFlags.
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  *
@@ -30730,7 +30746,7 @@
  * @stream: a #GOutputStream.
  * @bytes_written: (out): location to store the number of bytes that was
  *     written to the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  * @format: the format string. See the printf() documentation
  * @args: the parameters to insert into the format string
@@ -30758,7 +30774,7 @@
  * @stream: a #GOutputStream.
  * @buffer: (array length=count) (element-type guint8): the buffer containing the data to write.
  * @count: the number of bytes to write
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to write @count bytes from @buffer into the stream. Will block
@@ -30793,7 +30809,7 @@
  * @count: the number of bytes to write
  * @bytes_written: (out): location to store the number of bytes that was
  *     written to the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to write @count bytes from @buffer into the stream. Will block
@@ -30826,7 +30842,7 @@
  * @buffer: (array length=count) (element-type guint8): the buffer containing the data to write
  * @count: the number of bytes to write
  * @io_priority: the io priority of the request
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -30879,7 +30895,7 @@
  * @buffer: (array length=count) (element-type guint8): the buffer containing the data to write.
  * @count: the number of bytes to write
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -30925,7 +30941,7 @@
  * g_output_stream_write_bytes:
  * @stream: a #GOutputStream.
  * @bytes: the #GBytes to write
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * A wrapper function for g_output_stream_write() which takes a
@@ -30949,7 +30965,7 @@
  * @stream: A #GOutputStream.
  * @bytes: The bytes to write
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): callback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -30998,7 +31014,7 @@
 /**
  * g_permission_acquire:
  * @permission: a #GPermission instance
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a %NULL #GError, or %NULL
  *
  * Attempts to acquire the permission represented by @permission.
@@ -31025,7 +31041,7 @@
 /**
  * g_permission_acquire_async:
  * @permission: a #GPermission instance
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: the #GAsyncReadyCallback to call when done
  * @user_data: the user data to pass to @callback
  *
@@ -31114,7 +31130,7 @@
 /**
  * g_permission_release:
  * @permission: a #GPermission instance
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a %NULL #GError, or %NULL
  *
  * Attempts to release the permission represented by @permission.
@@ -31141,7 +31157,7 @@
 /**
  * g_permission_release_async:
  * @permission: a #GPermission instance
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: the #GAsyncReadyCallback to call when done
  * @user_data: the user data to pass to @callback
  *
@@ -31191,7 +31207,7 @@
 /**
  * g_pollable_input_stream_create_source:
  * @stream: a #GPollableInputStream.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  *
  * Creates a #GSource that triggers when @stream can be read, or
  * @cancellable is triggered or an error occurs. The callback on the
@@ -31234,7 +31250,7 @@
  * @buffer: (array length=count) (element-type guint8): a buffer to
  *     read data into (which should be at least @count bytes long).
  * @count: the number of bytes you want to read
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Attempts to read up to @count bytes from @stream into @buffer, as
@@ -31274,7 +31290,7 @@
 /**
  * g_pollable_output_stream_create_source:
  * @stream: a #GPollableOutputStream.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  *
  * Creates a #GSource that triggers when @stream can be written, or
  * @cancellable is triggered or an error occurs. The callback on the
@@ -31317,7 +31333,7 @@
  * @buffer: (array length=count) (element-type guint8): a buffer to write
  *     data from
  * @count: the number of bytes you want to write
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Attempts to write up to @count bytes from @buffer to @stream, as
@@ -31356,8 +31372,8 @@
  * g_pollable_source_new_full:
  * @pollable_stream: (type GObject): the stream associated with the
  *   new source
- * @child_source: (allow-none): optional child source to attach
- * @cancellable: (allow-none): optional #GCancellable to attach
+ * @child_source: (nullable): optional child source to attach
+ * @cancellable: (nullable): optional #GCancellable to attach
  *
  * Utility method for #GPollableInputStream and #GPollableOutputStream
  * implementations. Creates a new #GSource, as with
@@ -31376,7 +31392,7 @@
  *   read data into
  * @count: the number of bytes to read
  * @blocking: whether to do blocking I/O
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to read from @stream, as with g_input_stream_read() (if
@@ -31401,7 +31417,7 @@
  *   containing the data to write.
  * @count: the number of bytes to write
  * @blocking: whether to do blocking I/O
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to write to @stream, as with g_output_stream_write() (if
@@ -31429,7 +31445,7 @@
  * @blocking: whether to do blocking I/O
  * @bytes_written: (out): location to store the number of bytes that was
  *   written to the stream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: location to store the error occurring, or %NULL to ignore
  *
  * Tries to write @count bytes to @stream, as with
@@ -31566,9 +31582,9 @@
  * @protocol: The proxy protocol to support, in lower case (e.g. socks, http).
  * @dest_hostname: The destination hostname the proxy should tunnel to.
  * @dest_port: The destination port to tunnel to.
- * @username: (allow-none): The username to authenticate to the proxy server
+ * @username: (nullable): The username to authenticate to the proxy server
  *     (or %NULL).
- * @password: (allow-none): The password to authenticate to the proxy server
+ * @password: (nullable): The password to authenticate to the proxy server
  *     (or %NULL).
  *
  * Creates a new #GProxyAddress for @inetaddr with @protocol that should
@@ -31588,7 +31604,7 @@
  * @proxy: a #GProxy
  * @connection: a #GIOStream
  * @proxy_address: a #GProxyAddress
- * @cancellable: (allow-none): a #GCancellable
+ * @cancellable: (nullable): a #GCancellable
  * @error: return #GError
  *
  * Given @connection to communicate with a proxy (eg, a
@@ -31608,7 +31624,7 @@
  * @proxy: a #GProxy
  * @connection: a #GIOStream
  * @proxy_address: a #GProxyAddress
- * @cancellable: (allow-none): a #GCancellable
+ * @cancellable: (nullable): a #GCancellable
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): callback data
  *
@@ -31671,7 +31687,7 @@
  * g_proxy_resolver_lookup:
  * @resolver: a #GProxyResolver
  * @uri: a URI representing the destination to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Looks into the system proxy configuration to determine what proxy,
@@ -31701,7 +31717,7 @@
  * g_proxy_resolver_lookup_async:
  * @resolver: a #GProxyResolver
  * @uri: a URI representing the destination to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): callback to call after resolution completes
  * @user_data: (closure): data for @callback
  *
@@ -31750,7 +31766,7 @@
  * g_remote_action_group_activate_action_full:
  * @remote: a #GDBusActionGroup
  * @action_name: the name of the action to activate
- * @parameter: (allow-none): the optional parameter to the activation
+ * @parameter: (nullable): the optional parameter to the activation
  * @platform_data: the platform data to send
  *
  * Activates the remote action.
@@ -31840,7 +31856,7 @@
  * g_resolver_lookup_by_address:
  * @resolver: a #GResolver
  * @address: the address to reverse-resolve
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Synchronously reverse-resolves @address to determine its
@@ -31863,7 +31879,7 @@
  * g_resolver_lookup_by_address_async:
  * @resolver: a #GResolver
  * @address: the address to reverse-resolve
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): callback to call after resolution completes
  * @user_data: (closure): data for @callback
  *
@@ -31898,7 +31914,7 @@
  * g_resolver_lookup_by_name:
  * @resolver: a #GResolver
  * @hostname: the hostname to look up
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Synchronously resolves @hostname to determine its associated IP
@@ -31937,7 +31953,7 @@
  * g_resolver_lookup_by_name_async:
  * @resolver: a #GResolver
  * @hostname: the hostname to look up the address of
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): callback to call after resolution completes
  * @user_data: (closure): data for @callback
  *
@@ -31975,7 +31991,7 @@
  * @resolver: a #GResolver
  * @rrname: the DNS name to lookup the record for
  * @record_type: the type of DNS record to lookup
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Synchronously performs a DNS record lookup for the given @rrname and returns
@@ -32002,7 +32018,7 @@
  * @resolver: a #GResolver
  * @rrname: the DNS name to lookup the record for
  * @record_type: the type of DNS record to lookup
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): callback to call after resolution completes
  * @user_data: (closure): data for @callback
  *
@@ -32044,7 +32060,7 @@
  * @service: the service type to look up (eg, "ldap")
  * @protocol: the networking protocol to use for @service (eg, "tcp")
  * @domain: the DNS domain to look up the service in
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: return location for a #GError, or %NULL
  *
  * Synchronously performs a DNS SRV lookup for the given @service and
@@ -32083,7 +32099,7 @@
  * @service: the service type to look up (eg, "ldap")
  * @protocol: the networking protocol to use for @service (eg, "tcp")
  * @domain: the DNS domain to look up the service in
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): callback to call after resolution completes
  * @user_data: (closure): data for @callback
  *
@@ -32171,9 +32187,9 @@
  * @resource: A #GResource
  * @path: A pathname inside the resource
  * @lookup_flags: A #GResourceLookupFlags
- * @size: (out) (allow-none): a location to place the length of the contents of the file,
+ * @size: (out) (optional): a location to place the length of the contents of the file,
  *    or %NULL if the length is not needed
- * @flags: (out) (allow-none): a location to place the flags about the file,
+ * @flags: (out) (optional): a location to place the flags about the file,
  *    or %NULL if the length is not needed
  * @error: return location for a #GError, or %NULL
  *
@@ -32313,9 +32329,9 @@
  * g_resources_get_info:
  * @path: A pathname inside the resource
  * @lookup_flags: A #GResourceLookupFlags
- * @size: (out) (allow-none): a location to place the length of the contents of the file,
+ * @size: (out) (optional): a location to place the length of the contents of the file,
  *    or %NULL if the length is not needed
- * @flags: (out) (allow-none): a location to place the flags about the file,
+ * @flags: (out) (optional): a location to place the flags about the file,
  *    or %NULL if the length is not needed
  * @error: return location for a #GError, or %NULL
  *
@@ -32421,7 +32437,7 @@
  * @seekable: a #GSeekable.
  * @offset: a #goffset.
  * @type: a #GSeekType.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -32460,7 +32476,7 @@
  * g_seekable_truncate: (virtual truncate_fn)
  * @seekable: a #GSeekable.
  * @offset: a #goffset.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -32542,7 +32558,7 @@
  * @path: (out): the location to save the path
  * @keys: (out) (transfer container) (array zero-terminated=1): the
  *        location to save the relative keys
- * @values: (out) (allow-none) (transfer container) (array zero-terminated=1):
+ * @values: (out) (optional) (transfer container) (array zero-terminated=1):
  *          the location to save the values, or %NULL
  *
  * Calculate the longest common prefix of all keys in a tree and write
@@ -32875,7 +32891,7 @@
  * It is a programmer error to give a @key that isn't contained in the
  * schema for @settings.
  *
- * Returns: (allow-none) (transfer full): the default value
+ * Returns: (nullable) (transfer full): the default value
  * Since: 2.40
  */
 
@@ -33135,7 +33151,7 @@
  * It is a programmer error to give a @key that isn't contained in the
  * schema for @settings.
  *
- * Returns: (allow-none) (transfer full): the user's value, if set
+ * Returns: (nullable) (transfer full): the user's value, if set
  * Since: 2.40
  */
 
@@ -33261,8 +33277,8 @@
 /**
  * g_settings_new_full:
  * @schema: a #GSettingsSchema
- * @backend: (allow-none): a #GSettingsBackend
- * @path: (allow-none): the path to use
+ * @backend: (nullable): a #GSettingsBackend
+ * @path: (nullable): the path to use
  *
  * Creates a new #GSettings object with a given schema, backend and
  * path.
@@ -33730,7 +33746,7 @@
 /**
  * g_settings_schema_source_new_from_directory:
  * @directory: (type filename): the filename of a directory
- * @parent: (allow-none): a #GSettingsSchemaSource, or %NULL
+ * @parent: (nullable): a #GSettingsSchemaSource, or %NULL
  * @trusted: %TRUE, if the directory is trusted
  * @error: a pointer to a #GError pointer set to %NULL, or %NULL
  *
@@ -33962,7 +33978,7 @@
  * g_settings_set_strv:
  * @settings: a #GSettings object
  * @key: the name of the key to set
- * @value: (allow-none) (array zero-terminated=1): the value to set it to, or %NULL
+ * @value: (nullable) (array zero-terminated=1): the value to set it to, or %NULL
  *
  * Sets @key in @settings to @value.
  *
@@ -34145,7 +34161,7 @@
 /**
  * g_simple_action_new:
  * @name: the name of the action
- * @parameter_type: (allow-none): the type of parameter to the activate function
+ * @parameter_type: (nullable): the type of parameter to the activate function
  *
  * Creates a new action.
  *
@@ -34159,7 +34175,7 @@
 /**
  * g_simple_action_new_stateful:
  * @name: the name of the action
- * @parameter_type: (allow-none): the type of the parameter to the activate function
+ * @parameter_type: (nullable): the type of the parameter to the activate function
  * @state: the initial state of the action
  *
  * Creates a new stateful action.
@@ -34214,7 +34230,7 @@
 /**
  * g_simple_action_set_state_hint:
  * @simple: a #GSimpleAction
- * @state_hint: (allow-none): a #GVariant representing the state hint
+ * @state_hint: (nullable): a #GVariant representing the state hint
  *
  * Sets the state hint for the action.
  *
@@ -34227,7 +34243,7 @@
 
 /**
  * g_simple_async_report_error_in_idle: (skip)
- * @object: (allow-none): a #GObject, or %NULL.
+ * @object: (nullable): a #GObject, or %NULL.
  * @callback: a #GAsyncReadyCallback.
  * @user_data: user data passed to @callback.
  * @domain: a #GQuark containing the error domain (usually #G_IO_ERROR).
@@ -34245,7 +34261,7 @@
 
 /**
  * g_simple_async_report_gerror_in_idle:
- * @object: (allow-none): a #GObject, or %NULL
+ * @object: (nullable): a #GObject, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  * @error: the #GError to report
@@ -34260,7 +34276,7 @@
 
 /**
  * g_simple_async_report_take_gerror_in_idle: (skip)
- * @object: (allow-none): a #GObject, or %NULL
+ * @object: (nullable): a #GObject, or %NULL
  * @callback: a #GAsyncReadyCallback.
  * @user_data: user data passed to @callback.
  * @error: the #GError to report
@@ -34354,8 +34370,8 @@
 /**
  * g_simple_async_result_is_valid:
  * @result: the #GAsyncResult passed to the _finish function.
- * @source: (allow-none): the #GObject passed to the _finish function.
- * @source_tag: (allow-none): the asynchronous function.
+ * @source: (nullable): the #GObject passed to the _finish function.
+ * @source_tag: (nullable): the asynchronous function.
  *
  * Ensures that the data passed to the _finish function of an async
  * operation is consistent.  Three checks are performed.
@@ -34378,7 +34394,7 @@
 
 /**
  * g_simple_async_result_new:
- * @source_object: (allow-none): a #GObject, or %NULL.
+ * @source_object: (nullable): a #GObject, or %NULL.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  * @source_tag: the asynchronous function.
@@ -34401,7 +34417,7 @@
 
 /**
  * g_simple_async_result_new_error:
- * @source_object: (allow-none): a #GObject, or %NULL.
+ * @source_object: (nullable): a #GObject, or %NULL.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  * @domain: a #GQuark.
@@ -34418,7 +34434,7 @@
 
 /**
  * g_simple_async_result_new_from_error:
- * @source_object: (allow-none): a #GObject, or %NULL.
+ * @source_object: (nullable): a #GObject, or %NULL.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @user_data: (closure): user data passed to @callback.
  * @error: a #GError
@@ -34432,7 +34448,7 @@
 
 /**
  * g_simple_async_result_new_take_error: (skip)
- * @source_object: (allow-none): a #GObject, or %NULL
+ * @source_object: (nullable): a #GObject, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data passed to @callback
  * @error: a #GError
@@ -34468,7 +34484,7 @@
  * @simple: a #GSimpleAsyncResult.
  * @func: a #GSimpleAsyncThreadFunc.
  * @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  *
  * Runs the asynchronous job in a separate thread and then calls
  * g_simple_async_result_complete_in_idle() on @simple to return
@@ -34484,7 +34500,7 @@
 /**
  * g_simple_async_result_set_check_cancellable:
  * @simple: a #GSimpleAsyncResult
- * @check_cancellable: (allow-none): a #GCancellable to check, or %NULL to unset
+ * @check_cancellable: (nullable): a #GCancellable to check, or %NULL to unset
  *
  * Sets a #GCancellable to check before dispatching results.
  *
@@ -34637,9 +34653,9 @@
 
 /**
  * g_simple_proxy_resolver_new:
- * @default_proxy: (allow-none): the default proxy to use, eg
+ * @default_proxy: (nullable): the default proxy to use, eg
  *     "socks://192.168.1.1"
- * @ignore_hosts: (allow-none): an optional list of hosts/IP addresses
+ * @ignore_hosts: (nullable): an optional list of hosts/IP addresses
  *     to not use a proxy for.
  *
  * Creates a new #GSimpleProxyResolver. See
@@ -34706,7 +34722,7 @@
 /**
  * g_socket_accept:
  * @socket: a #GSocket.
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Accept incoming connections on a connection-based socket. This removes
@@ -34729,7 +34745,7 @@
 /**
  * g_socket_address_enumerator_next:
  * @enumerator: a #GSocketAddressEnumerator
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError.
  *
  * Retrieves the next #GSocketAddress from @enumerator. Note that this
@@ -34755,7 +34771,7 @@
 /**
  * g_socket_address_enumerator_next_async:
  * @enumerator: a #GSocketAddressEnumerator
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request
  *     is satisfied
  * @user_data: (closure): the data to pass to callback function
@@ -34924,7 +34940,7 @@
  * g_socket_client_connect:
  * @client: a #GSocketClient.
  * @connectable: a #GSocketConnectable specifying the remote address.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Tries to resolve the @connectable and make a network connection to it.
@@ -34955,7 +34971,7 @@
  * g_socket_client_connect_async:
  * @client: a #GSocketClient
  * @connectable: a #GSocketConnectable specifying the remote address.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -34988,7 +35004,7 @@
  * @client: a #GSocketClient
  * @host_and_port: the name and optionally port of the host to connect to
  * @default_port: the default port to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a #GError, or %NULL
  *
  * This is a helper function for g_socket_client_connect().
@@ -35032,7 +35048,7 @@
  * @client: a #GSocketClient
  * @host_and_port: the name and optionally the port of the host to connect to
  * @default_port: the default port to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -35065,7 +35081,7 @@
  * @client: a #GSocketConnection
  * @domain: a domain name
  * @service: the name of the service to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a #GError, or %NULL
  *
  * Attempts to create a TCP connection to a service.
@@ -35092,7 +35108,7 @@
  * @client: a #GSocketClient
  * @domain: a domain name
  * @service: the name of the service to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -35122,7 +35138,7 @@
  * @client: a #GSocketClient
  * @uri: A network URI
  * @default_port: the default port to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a pointer to a #GError, or %NULL
  *
  * This is a helper function for g_socket_client_connect().
@@ -35157,7 +35173,7 @@
  * @client: a #GSocketClient
  * @uri: a network uri
  * @default_port: the default port to connect to
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -35347,7 +35363,7 @@
 /**
  * g_socket_client_set_local_address:
  * @client: a #GSocketClient.
- * @address: (allow-none): a #GSocketAddress, or %NULL
+ * @address: (nullable): a #GSocketAddress, or %NULL
  *
  * Sets the local address of the socket client.
  * The sockets created by this object will bound to the
@@ -35380,7 +35396,7 @@
 /**
  * g_socket_client_set_proxy_resolver:
  * @client: a #GSocketClient.
- * @proxy_resolver: (allow-none): a #GProxyResolver, or %NULL for the
+ * @proxy_resolver: (nullable): a #GProxyResolver, or %NULL for the
  *   default.
  *
  * Overrides the #GProxyResolver used by @client. You can call this if
@@ -35540,7 +35556,7 @@
  * @socket: a #GSocket
  * @condition: a #GIOCondition mask to wait for
  * @timeout: the maximum time (in microseconds) to wait, or -1
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a #GError pointer, or %NULL
  *
  * Waits for up to @timeout microseconds for @condition to become true
@@ -35569,7 +35585,7 @@
  * g_socket_condition_wait:
  * @socket: a #GSocket
  * @condition: a #GIOCondition mask to wait for
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a #GError pointer, or %NULL
  *
  * Waits for @condition to become true on @socket. When the condition
@@ -35592,7 +35608,7 @@
  * g_socket_connect:
  * @socket: a #GSocket.
  * @address: a #GSocketAddress specifying the remote address.
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Connect the socket to the specified remote address.
@@ -35666,7 +35682,7 @@
  * g_socket_connection_connect:
  * @connection: a #GSocketConnection
  * @address: a #GSocketAddress specifying the remote address.
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Connect @connection to the specified remote address.
@@ -35680,7 +35696,7 @@
  * g_socket_connection_connect_async:
  * @connection: a #GSocketConnection
  * @address: a #GSocketAddress specifying the remote address.
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -35886,7 +35902,7 @@
  * g_socket_create_source: (skip)
  * @socket: a #GSocket
  * @condition: a #GIOCondition mask to monitor
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  *
  * Creates a #GSource that can be attached to a %GMainContext to monitor
  * for the availability of the specified @condition on the socket. The #GSource
@@ -36198,7 +36214,7 @@
  * g_socket_join_multicast_group:
  * @socket: a #GSocket.
  * @group: a #GInetAddress specifying the group address to join.
- * @iface: (allow-none): Name of the interface to use, or %NULL
+ * @iface: (nullable): Name of the interface to use, or %NULL
  * @source_specific: %TRUE if source-specific multicast should be used
  * @error: #GError for error reporting, or %NULL to ignore.
  *
@@ -36223,7 +36239,7 @@
  * g_socket_leave_multicast_group:
  * @socket: a #GSocket.
  * @group: a #GInetAddress specifying the group address to leave.
- * @iface: (allow-none): Interface used
+ * @iface: (nullable): Interface used
  * @source_specific: %TRUE if source-specific multicast was used
  * @error: #GError for error reporting, or %NULL to ignore.
  *
@@ -36261,8 +36277,8 @@
 /**
  * g_socket_listener_accept:
  * @listener: a #GSocketListener
- * @source_object: (out) (transfer none) (allow-none): location where #GObject pointer will be stored, or %NULL
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @source_object: (out) (transfer none) (optional): location where #GObject pointer will be stored, or %NULL
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Blocks waiting for a client to connect to any of the sockets added
@@ -36285,7 +36301,7 @@
 /**
  * g_socket_listener_accept_async:
  * @listener: a #GSocketListener
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -36303,7 +36319,7 @@
  * g_socket_listener_accept_finish:
  * @listener: a #GSocketListener
  * @result: a #GAsyncResult.
- * @source_object: (out) (transfer none) (allow-none): Optional #GObject identifying this source
+ * @source_object: (out) (transfer none) (optional): Optional #GObject identifying this source
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -36317,8 +36333,8 @@
 /**
  * g_socket_listener_accept_socket:
  * @listener: a #GSocketListener
- * @source_object: (out) (transfer none) (allow-none): location where #GObject pointer will be stored, or %NULL.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @source_object: (out) (transfer none) (optional): location where #GObject pointer will be stored, or %NULL.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Blocks waiting for a client to connect to any of the sockets added
@@ -36344,7 +36360,7 @@
 /**
  * g_socket_listener_accept_socket_async:
  * @listener: a #GSocketListener
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: (scope async): a #GAsyncReadyCallback
  * @user_data: (closure): user data for the callback
  *
@@ -36362,7 +36378,7 @@
  * g_socket_listener_accept_socket_finish:
  * @listener: a #GSocketListener
  * @result: a #GAsyncResult.
- * @source_object: (out) (transfer none) (allow-none): Optional #GObject identifying this source
+ * @source_object: (out) (transfer none) (optional): Optional #GObject identifying this source
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -36379,8 +36395,8 @@
  * @address: a #GSocketAddress
  * @type: a #GSocketType
  * @protocol: a #GSocketProtocol
- * @source_object: (allow-none): Optional #GObject identifying this source
- * @effective_address: (out) (allow-none): location to store the address that was bound to, or %NULL.
+ * @source_object: (nullable): Optional #GObject identifying this source
+ * @effective_address: (out) (optional): location to store the address that was bound to, or %NULL.
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Creates a socket of type @type and protocol @protocol, binds
@@ -36411,7 +36427,7 @@
 /**
  * g_socket_listener_add_any_inet_port:
  * @listener: a #GSocketListener
- * @source_object: (allow-none): Optional #GObject identifying this source
+ * @source_object: (nullable): Optional #GObject identifying this source
  * @error: a #GError location to store the error occurring, or %NULL to
  * ignore.
  *
@@ -36435,7 +36451,7 @@
  * g_socket_listener_add_inet_port:
  * @listener: a #GSocketListener
  * @port: an IP port number (non-zero)
- * @source_object: (allow-none): Optional #GObject identifying this source
+ * @source_object: (nullable): Optional #GObject identifying this source
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Helper function for g_socket_listener_add_address() that
@@ -36456,7 +36472,7 @@
  * g_socket_listener_add_socket:
  * @listener: a #GSocketListener
  * @socket: a listening #GSocket
- * @source_object: (allow-none): Optional #GObject identifying this source
+ * @source_object: (nullable): Optional #GObject identifying this source
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Adds @socket to the set of sockets that we try to accept
@@ -36571,7 +36587,7 @@
  * @buffer: (array length=size) (element-type guint8): a buffer to
  *     read data into (which should be at least @size bytes long).
  * @size: the number of bytes you want to read from the socket
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Receive data (up to @size bytes) from a socket. This is mainly used by
@@ -36607,12 +36623,12 @@
 /**
  * g_socket_receive_from:
  * @socket: a #GSocket
- * @address: (out) (allow-none): a pointer to a #GSocketAddress
+ * @address: (out) (optional): a pointer to a #GSocketAddress
  *     pointer, or %NULL
  * @buffer: (array length=size) (element-type guint8): a buffer to
  *     read data into (which should be at least @size bytes long).
  * @size: the number of bytes you want to read from the socket
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Receive data (up to @size bytes) from a socket.
@@ -36632,11 +36648,11 @@
 /**
  * g_socket_receive_message:
  * @socket: a #GSocket
- * @address: (out) (nullable): a pointer to a #GSocketAddress
+ * @address: (out) (optional): a pointer to a #GSocketAddress
  *     pointer, or %NULL
  * @vectors: (array length=num_vectors): an array of #GInputVector structs
  * @num_vectors: the number of elements in @vectors, or -1
- * @messages: (array length=num_messages) (out) (nullable): a pointer which
+ * @messages: (array length=num_messages) (out) (optional): a pointer which
  *    may be filled with an array of #GSocketControlMessages, or %NULL
  * @num_messages: (out): a pointer which will be filled with the number of
  *    elements in @messages, or %NULL
@@ -36716,7 +36732,7 @@
  * @messages: (array length=num_messages): an array of #GInputMessage structs
  * @num_messages: the number of elements in @messages
  * @flags: an int containing #GSocketMsgFlags flags for the overall operation
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore
  *
  * Receive multiple data messages from @socket in one go.  This is the most
@@ -36784,7 +36800,7 @@
  *     read data into (which should be at least @size bytes long).
  * @size: the number of bytes you want to read from the socket
  * @blocking: whether to do blocking or non-blocking I/O
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * This behaves exactly the same as g_socket_receive(), except that
@@ -36803,7 +36819,7 @@
  * @buffer: (array length=size) (element-type guint8): the buffer
  *     containing the data to send.
  * @size: the number of bytes to send
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Tries to send @size bytes from @buffer on the socket. This is
@@ -36830,14 +36846,14 @@
 /**
  * g_socket_send_message:
  * @socket: a #GSocket
- * @address: (allow-none): a #GSocketAddress, or %NULL
+ * @address: (nullable): a #GSocketAddress, or %NULL
  * @vectors: (array length=num_vectors): an array of #GOutputVector structs
  * @num_vectors: the number of elements in @vectors, or -1
- * @messages: (array length=num_messages) (allow-none): a pointer to an
+ * @messages: (array length=num_messages) (nullable): a pointer to an
  *   array of #GSocketControlMessages, or %NULL.
  * @num_messages: number of elements in @messages, or -1.
  * @flags: an int containing #GSocketMsgFlags flags
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Send data to @address on @socket.  For sending multiple messages see
@@ -36890,7 +36906,7 @@
  * @messages: (array length=num_messages): an array of #GOutputMessage structs
  * @num_messages: the number of elements in @messages
  * @flags: an int containing #GSocketMsgFlags flags
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Send multiple data messages from @socket in one go.  This is the most
@@ -36939,11 +36955,11 @@
 /**
  * g_socket_send_to:
  * @socket: a #GSocket
- * @address: (allow-none): a #GSocketAddress, or %NULL
+ * @address: (nullable): a #GSocketAddress, or %NULL
  * @buffer: (array length=size) (element-type guint8): the buffer
  *     containing the data to send.
  * @size: the number of bytes to send
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Tries to send @size bytes from @buffer to @address. If @address is
@@ -36965,7 +36981,7 @@
  *     containing the data to send.
  * @size: the number of bytes to send
  * @blocking: whether to do blocking or non-blocking I/O
- * @cancellable: (allow-none): a %GCancellable or %NULL
+ * @cancellable: (nullable): a %GCancellable or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * This behaves exactly the same as g_socket_send(), except that
@@ -37409,7 +37425,7 @@
 /**
  * g_subprocess_communicate:
  * @subprocess: a #GSubprocess
- * @stdin_buf: (allow-none): data to send to the stdin of the subprocess, or %NULL
+ * @stdin_buf: (nullable): data to send to the stdin of the subprocess, or %NULL
  * @cancellable: a #GCancellable
  * @stdout_buf: (out): data read from the subprocess stdout
  * @stderr_buf: (out): data read from the subprocess stderr
@@ -37465,8 +37481,8 @@
 /**
  * g_subprocess_communicate_async:
  * @subprocess: Self
- * @stdin_buf: (allow-none): Input data, or %NULL
- * @cancellable: (allow-none): Cancellable
+ * @stdin_buf: (nullable): Input data, or %NULL
+ * @cancellable: (nullable): Cancellable
  * @callback: Callback
  * @user_data: User data
  *
@@ -37490,7 +37506,7 @@
 /**
  * g_subprocess_communicate_utf8:
  * @subprocess: a #GSubprocess
- * @stdin_buf: (allow-none): data to send to the stdin of the subprocess, or %NULL
+ * @stdin_buf: (nullable): data to send to the stdin of the subprocess, or %NULL
  * @cancellable: a #GCancellable
  * @stdout_buf: (out): data read from the subprocess stdout
  * @stderr_buf: (out): data read from the subprocess stderr
@@ -37504,7 +37520,7 @@
 /**
  * g_subprocess_communicate_utf8_async:
  * @subprocess: Self
- * @stdin_buf: (allow-none): Input data, or %NULL
+ * @stdin_buf: (nullable): Input data, or %NULL
  * @cancellable: Cancellable
  * @callback: Callback
  * @user_data: User data
@@ -38045,7 +38061,7 @@
 /**
  * g_subprocess_new: (skip)
  * @flags: flags that define the behaviour of the subprocess
- * @error: (allow-none): return location for an error, or %NULL
+ * @error: (nullable): return location for an error, or %NULL
  * @argv0: first commandline argument to pass to the subprocess
  * @...: more commandline arguments, followed by %NULL
  *
@@ -38067,7 +38083,7 @@
  * g_subprocess_newv: (rename-to g_subprocess_new)
  * @argv: (array zero-terminated=1) (element-type utf8): commandline arguments for the subprocess
  * @flags: flags that define the behaviour of the subprocess
- * @error: (allow-none): return location for an error, or %NULL
+ * @error: (nullable): return location for an error, or %NULL
  *
  * Create a new process with the given flags and argument list.
  *
@@ -38330,7 +38346,7 @@
 /**
  * g_task_is_valid:
  * @result: (type Gio.AsyncResult): A #GAsyncResult
- * @source_object: (allow-none) (type GObject): the source object
+ * @source_object: (nullable) (type GObject): the source object
  *   expected to be associated with the task
  *
  * Checks that @result is a #GTask, and that @source_object is its
@@ -38345,9 +38361,9 @@
 
 /**
  * g_task_new:
- * @source_object: (allow-none) (type GObject): the #GObject that owns
+ * @source_object: (nullable) (type GObject): the #GObject that owns
  *   this task, or %NULL.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @callback_data: (closure): user data passed to @callback.
  *
@@ -38430,7 +38446,7 @@
 
 /**
  * g_task_report_error:
- * @source_object: (allow-none) (type GObject): the #GObject that owns
+ * @source_object: (nullable) (type GObject): the #GObject that owns
  *   this task, or %NULL.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @callback_data: (closure): user data passed to @callback.
@@ -38452,7 +38468,7 @@
 
 /**
  * g_task_report_new_error:
- * @source_object: (allow-none) (type GObject): the #GObject that owns
+ * @source_object: (nullable) (type GObject): the #GObject that owns
  *   this task, or %NULL.
  * @callback: (scope async): a #GAsyncReadyCallback.
  * @callback_data: (closure): user data passed to @callback.
@@ -38559,9 +38575,9 @@
 /**
  * g_task_return_pointer:
  * @task: a #GTask
- * @result: (allow-none) (transfer full): the pointer result of a task
+ * @result: (nullable) (transfer full): the pointer result of a task
  *     function
- * @result_destroy: (allow-none): a #GDestroyNotify function.
+ * @result_destroy: (nullable): a #GDestroyNotify function.
  *
  * Sets @task's result to @result and completes the task. If @result
  * is not %NULL, then @result_destroy will be used to free @result if
@@ -38737,8 +38753,8 @@
 /**
  * g_task_set_task_data:
  * @task: the #GTask
- * @task_data: (allow-none): task-specific data
- * @task_data_destroy: (allow-none): #GDestroyNotify for @task_data
+ * @task_data: (nullable): task-specific data
+ * @task_data_destroy: (nullable): #GDestroyNotify for @task_data
  *
  * Sets @task's task data (freeing the existing task data, if any).
  *
@@ -38829,7 +38845,7 @@
  * been called yet, %NULL is returned. This can be used with
  * g_dbus_connection_new_for_address().
  *
- * Returns: (allow-none): the address of the bus, or %NULL.
+ * Returns: (nullable): the address of the bus, or %NULL.
  */
 
 
@@ -39233,8 +39249,8 @@
 /**
  * g_tls_certificate_verify:
  * @cert: a #GTlsCertificate
- * @identity: (allow-none): the expected peer identity
- * @trusted_ca: (allow-none): the certificate of a trusted authority
+ * @identity: (nullable): the expected peer identity
+ * @trusted_ca: (nullable): the certificate of a trusted authority
  *
  * This verifies @cert and returns a set of #GTlsCertificateFlags
  * indicating any problems found with it. This can be used to verify a
@@ -39336,7 +39352,7 @@
 /**
  * g_tls_client_connection_new:
  * @base_io_stream: the #GIOStream to wrap
- * @server_identity: (allow-none): the expected identity of the server
+ * @server_identity: (nullable): the expected identity of the server
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Creates a new #GTlsClientConnection wrapping @base_io_stream (which
@@ -39514,7 +39530,7 @@
 /**
  * g_tls_connection_handshake:
  * @conn: a #GTlsConnection
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @error: a #GError, or %NULL
  *
  * Attempts a TLS handshake on @conn.
@@ -39549,7 +39565,7 @@
  * g_tls_connection_handshake_async:
  * @conn: a #GTlsConnection
  * @io_priority: the [I/O priority][io-priority] of the request
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the handshake is complete
  * @user_data: the data to pass to the callback function
  *
@@ -39624,7 +39640,7 @@
 /**
  * g_tls_connection_set_interaction:
  * @conn: a connection
- * @interaction: (allow-none): an interaction object, or %NULL
+ * @interaction: (nullable): an interaction object, or %NULL
  *
  * Set the object that will be used to interact with the user. It will be used
  * for things like prompting the user for passwords.
@@ -39745,10 +39761,10 @@
  * g_tls_database_lookup_certificate_for_handle:
  * @self: a #GTlsDatabase
  * @handle: a certificate handle
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: Flags which affect the lookup.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
- * @error: (allow-none): a #GError, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
+ * @error: (nullable): a #GError, or %NULL
  *
  * Lookup a certificate by its handle.
  *
@@ -39763,7 +39779,7 @@
  * This function can block, use g_tls_database_lookup_certificate_for_handle_async() to perform
  * the lookup operation asynchronously.
  *
- * Returns: (transfer full) (allow-none): a newly allocated
+ * Returns: (transfer full) (nullable): a newly allocated
  * #GTlsCertificate, or %NULL. Use g_object_unref() to release the certificate.
  * Since: 2.30
  */
@@ -39773,9 +39789,9 @@
  * g_tls_database_lookup_certificate_for_handle_async:
  * @self: a #GTlsDatabase
  * @handle: a certificate handle
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: Flags which affect the lookup.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the operation completes
  * @user_data: the data to pass to the callback function
  *
@@ -39808,10 +39824,10 @@
  * g_tls_database_lookup_certificate_issuer:
  * @self: a #GTlsDatabase
  * @certificate: a #GTlsCertificate
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: flags which affect the lookup operation
- * @cancellable: (allow-none): a #GCancellable, or %NULL
- * @error: (allow-none): a #GError, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
+ * @error: (nullable): a #GError, or %NULL
  *
  * Lookup the issuer of @certificate in the database.
  *
@@ -39832,9 +39848,9 @@
  * g_tls_database_lookup_certificate_issuer_async:
  * @self: a #GTlsDatabase
  * @certificate: a #GTlsCertificate
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: flags which affect the lookup operation
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the operation completes
  * @user_data: the data to pass to the callback function
  *
@@ -39864,10 +39880,10 @@
  * g_tls_database_lookup_certificates_issued_by:
  * @self: a #GTlsDatabase
  * @issuer_raw_dn: a #GByteArray which holds the DER encoded issuer DN.
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: Flags which affect the lookup operation.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
- * @error: (allow-none): a #GError, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
+ * @error: (nullable): a #GError, or %NULL
  *
  * Lookup certificates issued by this issuer in the database.
  *
@@ -39884,9 +39900,9 @@
  * g_tls_database_lookup_certificates_issued_by_async:
  * @self: a #GTlsDatabase
  * @issuer_raw_dn: a #GByteArray which holds the DER encoded issuer DN.
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: Flags which affect the lookup operation.
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the operation completes
  * @user_data: the data to pass to the callback function
  *
@@ -39921,11 +39937,11 @@
  * @self: a #GTlsDatabase
  * @chain: a #GTlsCertificate chain
  * @purpose: the purpose that this certificate chain will be used for.
- * @identity: (allow-none): the expected peer identity
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @identity: (nullable): the expected peer identity
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: additional verify flags
- * @cancellable: (allow-none): a #GCancellable, or %NULL
- * @error: (allow-none): a #GError, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
+ * @error: (nullable): a #GError, or %NULL
  *
  * Verify's a certificate chain after looking up and adding any missing
  * certificates to the chain.
@@ -39963,10 +39979,10 @@
  * @self: a #GTlsDatabase
  * @chain: a #GTlsCertificate chain
  * @purpose: the purpose that this certificate chain will be used for.
- * @identity: (allow-none): the expected peer identity
- * @interaction: (allow-none): used to interact with the user if necessary
+ * @identity: (nullable): the expected peer identity
+ * @interaction: (nullable): used to interact with the user if necessary
  * @flags: additional verify flags
- * @cancellable: (allow-none): a #GCancellable, or %NULL
+ * @cancellable: (nullable): a #GCancellable, or %NULL
  * @callback: callback to call when the operation completes
  * @user_data: the data to pass to the callback function
  *
@@ -40050,8 +40066,8 @@
  * @interaction: a #GTlsInteraction object
  * @password: a #GTlsPassword object
  * @cancellable: an optional #GCancellable cancellation object
- * @callback: (allow-none): will be called when the interaction completes
- * @user_data: (allow-none): data to pass to the @callback
+ * @callback: (nullable): will be called when the interaction completes
+ * @user_data: (nullable): data to pass to the @callback
  *
  * Run asynchronous interaction to ask the user for a password. In general,
  * g_tls_interaction_invoke_ask_password() should be used instead of this
@@ -40196,8 +40212,8 @@
  * @connection: a #GTlsConnection object
  * @flags: flags providing more information about the request
  * @cancellable: an optional #GCancellable cancellation object
- * @callback: (allow-none): will be called when the interaction completes
- * @user_data: (allow-none): data to pass to the @callback
+ * @callback: (nullable): will be called when the interaction completes
+ * @user_data: (nullable): data to pass to the @callback
  *
  * Run asynchronous interaction to ask the user for a certificate to use with
  * the connection. In general, g_tls_interaction_invoke_request_certificate() should
@@ -40259,7 +40275,7 @@
 /**
  * g_tls_password_get_value:
  * @password: a #GTlsPassword object
- * @length: (allow-none): location to place the length of the password.
+ * @length: (nullable): location to place the length of the password.
  *
  * Get the password value. If @length is not %NULL then it will be
  * filled in with the length of the password value. (Note that the
@@ -40341,7 +40357,7 @@
  * @password: a #GTlsPassword object
  * @value: the value for the password
  * @length: the length of the password, or -1
- * @destroy: (allow-none): a function to use to free the password.
+ * @destroy: (nullable): a function to use to free the password.
  *
  * Provide the value for this password.
  *
@@ -40373,7 +40389,7 @@
 /**
  * g_tls_server_connection_new:
  * @base_io_stream: the #GIOStream to wrap
- * @certificate: (allow-none): the default server certificate, or %NULL
+ * @certificate: (nullable): the default server certificate, or %NULL
  * @error: #GError for error reporting, or %NULL to ignore.
  *
  * Creates a new #GTlsServerConnection wrapping @base_io_stream (which
@@ -40392,7 +40408,7 @@
 /**
  * g_unix_connection_receive_credentials:
  * @connection: A #GUnixConnection.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Receives credentials from the sending end of the connection.  The
@@ -40415,7 +40431,7 @@
 /**
  * g_unix_connection_receive_credentials_async:
  * @connection: A #GUnixConnection.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -40449,8 +40465,8 @@
 /**
  * g_unix_connection_receive_fd:
  * @connection: a #GUnixConnection
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
- * @error: (allow-none): #GError for error reporting, or %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
+ * @error: (nullable): #GError for error reporting, or %NULL to ignore
  *
  * Receives a file descriptor from the sending end of the connection.
  * The sending end has to call g_unix_connection_send_fd() for this
@@ -40468,7 +40484,7 @@
 /**
  * g_unix_connection_send_credentials:
  * @connection: A #GUnixConnection.
- * @cancellable: (allow-none): A #GCancellable or %NULL.
+ * @cancellable: (nullable): A #GCancellable or %NULL.
  * @error: Return location for error or %NULL.
  *
  * Passes the credentials of the current user the receiving side
@@ -40491,7 +40507,7 @@
 /**
  * g_unix_connection_send_credentials_async:
  * @connection: A #GUnixConnection.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
  * @user_data: (closure): the data to pass to callback function
  *
@@ -40525,8 +40541,8 @@
  * g_unix_connection_send_fd:
  * @connection: a #GUnixConnection
  * @fd: a file descriptor
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
- * @error: (allow-none): #GError for error reporting, or %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
+ * @error: (nullable): #GError for error reporting, or %NULL to ignore.
  *
  * Passes a file descriptor to the receiving side of the
  * connection. The receiving end has to call g_unix_connection_receive_fd()
@@ -40676,7 +40692,7 @@
 /**
  * g_unix_fd_list_peek_fds:
  * @list: a #GUnixFDList
- * @length: (out) (allow-none): pointer to the length of the returned
+ * @length: (out) (optional): pointer to the length of the returned
  *     array, or %NULL
  *
  * Returns the array of file descriptors that is contained in this
@@ -40702,7 +40718,7 @@
 /**
  * g_unix_fd_list_steal_fds:
  * @list: a #GUnixFDList
- * @length: (out) (allow-none): pointer to the length of the returned
+ * @length: (out) (optional): pointer to the length of the returned
  *     array, or %NULL
  *
  * Returns the array of file descriptors that is contained in this
@@ -40788,7 +40804,7 @@
 /**
  * g_unix_fd_message_steal_fds:
  * @message: a #GUnixFDMessage
- * @length: (out) (allow-none): pointer to the length of the returned
+ * @length: (out) (optional): pointer to the length of the returned
  *     array, or %NULL
  *
  * Returns the array of file descriptors that is contained in this
@@ -40881,7 +40897,7 @@
 /**
  * g_unix_mount_at: (skip)
  * @mount_path: path for a possible unix mount.
- * @time_read: (out) (allow-none): guint64 to contain a timestamp.
+ * @time_read: (out) (optional): guint64 to contain a timestamp.
  *
  * Gets a #GUnixMountEntry for a given mount path. If @time_read
  * is set, it will be filled with a unix timestamp for checking
@@ -40906,7 +40922,7 @@
 /**
  * g_unix_mount_for: (skip)
  * @file_path: file path on some unix mount.
- * @time_read: (out) (allow-none): guint64 to contain a timestamp.
+ * @time_read: (out) (optional): guint64 to contain a timestamp.
  *
  * Gets a #GUnixMountEntry for a given file path. If @time_read
  * is set, it will be filled with a unix timestamp for checking
@@ -41247,7 +41263,7 @@
 
 /**
  * g_unix_mount_points_get: (skip)
- * @time_read: (out) (allow-none): guint64 to contain a timestamp.
+ * @time_read: (out) (optional): guint64 to contain a timestamp.
  *
  * Gets a #GList of #GUnixMountPoint containing the unix mount points.
  * If @time_read is set, it will be filled with the mount timestamp,
@@ -41271,7 +41287,7 @@
 
 /**
  * g_unix_mounts_get: (skip)
- * @time_read: (out) (allow-none): guint64 to contain a timestamp, or %NULL
+ * @time_read: (out) (optional): guint64 to contain a timestamp, or %NULL
  *
  * Gets a #GList of #GUnixMountEntry containing the unix mounts.
  * If @time_read is set, it will be filled with the mount
@@ -41628,8 +41644,8 @@
  * g_volume_eject:
  * @volume: a #GVolume
  * @flags: flags affecting the unmount if required for eject
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL
  * @user_data: user data that gets passed to @callback
  *
  * Ejects a volume. This is an asynchronous operation, and is
@@ -41658,10 +41674,10 @@
  * g_volume_eject_with_operation:
  * @volume: a #GVolume
  * @flags: flags affecting the unmount if required for eject
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to
  *     avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL
  * @user_data: user data passed to @callback
  *
  * Ejects a volume. This is an asynchronous operation, and is
@@ -41956,9 +41972,9 @@
  * g_volume_mount: (virtual mount_fn)
  * @volume: a #GVolume
  * @flags: flags affecting the operation
- * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid user interaction
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
- * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL
+ * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid user interaction
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
+ * @callback: (nullable): a #GAsyncReadyCallback, or %NULL
  * @user_data: user data that gets passed to @callback
  *
  * Mounts a volume. This is an asynchronous operation, and is
@@ -42115,7 +42131,7 @@
  * g_win32_registry_key_get_child:
  * @key: (in) (transfer none): a parent #GWin32RegistryKey
  * @subkey: (in) (transfer none): name of a child key to open (in UTF-8), relative to @key
- * @error: (inout) (nullable): a pointer to a %NULL #GError, or %NULL
+ * @error: (inout) (optional): a pointer to a %NULL #GError, or %NULL
  *
  * Opens a @subkey of the @key.
  *
@@ -42128,7 +42144,7 @@
  * g_win32_registry_key_get_child_w:
  * @key: (in) (transfer none): a parent #GWin32RegistryKey
  * @subkey: (in) (transfer none): name of a child key to open (in UTF-8), relative to @key
- * @error: (inout) (nullable): a pointer to a %NULL #GError, or %NULL
+ * @error: (inout) (optional): a pointer to a %NULL #GError, or %NULL
  *
  * Opens a @subkey of the @key.
  *
@@ -42248,7 +42264,7 @@
 /**
  * g_win32_registry_key_new_w:
  * @path: (in) (transfer none): absolute full name of a key to open (in UTF-16)
- * @error: (inout) (nullable): a pointer to a %NULL #GError, or %NULL
+ * @error: (inout) (optional): a pointer to a %NULL #GError, or %NULL
  *
  * Creates an object that represents a registry key specified by @path.
  * @path must start with one of the following pre-defined names:
@@ -42391,7 +42407,7 @@
  * g_win32_registry_subkey_iter_init:
  * @iter: (in) (transfer none): a pointer to a #GWin32RegistrySubkeyIter
  * @key: (in) (transfer none): a #GWin32RegistryKey to iterate over
- * @error: (inout) (nullable): a pointer to %NULL #GError, or %NULL
+ * @error: (inout) (optional): a pointer to %NULL #GError, or %NULL
  *
  * Initialises (without allocating) a #GWin32RegistrySubkeyIter.  @iter may be
  * completely uninitialised prior to this call; its old value is
@@ -42713,7 +42729,7 @@
 /**
  * g_zlib_compressor_set_file_info:
  * @compressor: a #GZlibCompressor
- * @file_info: (allow-none): a #GFileInfo
+ * @file_info: (nullable): a #GFileInfo
  *
  * Sets @file_info in @compressor. If non-%NULL, and @compressor's
  * #GZlibCompressor:format property is %G_ZLIB_COMPRESSOR_FORMAT_GZIP,