Create new perldelta for 5.22.4

10 files changed, 570 insertions, 148 deletions

diff --git a/MANIFEST b/MANIFEST
index a8d68546f8..92238dc155 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4570,6 +4570,7 @@ pod/perl5203delta.pod		Perl changes in version 5.20.3
 pod/perl5220delta.pod		Perl changes in version 5.22.0
 pod/perl5221delta.pod		Perl changes in version 5.22.1
 pod/perl5222delta.pod		Perl changes in version 5.22.2
+pod/perl5223delta.pod		Perl changes in version 5.22.3
 pod/perl561delta.pod		Perl changes in version 5.6.1
 pod/perl56delta.pod		Perl changes in version 5.6
 pod/perl581delta.pod		Perl changes in version 5.8.1
diff --git a/Makefile.SH b/Makefile.SH
index 21e120542c..4fa405b5bd 100755
--- a/Makefile.SH
+++ b/Makefile.SH
@@ -495,7 +495,7 @@ mini_obj = $(minindt_obj) $(MINIDTRACE_O)
 ndt_obj = $(obj0) $(obj1) $(obj2) $(obj3) $(ARCHOBJS)
 obj = $(ndt_obj) $(DTRACE_O)
 
-perltoc_pod_prereqs = extra.pods pod/perl5223delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl5224delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
 generated_pods = pod/perltoc.pod $(perltoc_pod_prereqs)
 generated_headers = uudmap.h bitcount.h mg_data.h
 
@@ -1023,9 +1023,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) pod/perlmodlib.PL -q
 
-pod/perl5223delta.pod: pod/perldelta.pod
-	$(RMS) pod/perl5223delta.pod
-	$(LNS) perldelta.pod pod/perl5223delta.pod
+pod/perl5224delta.pod: pod/perldelta.pod
+	$(RMS) pod/perl5224delta.pod
+	$(LNS) perldelta.pod pod/perl5224delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`
diff --git a/pod/.gitignore b/pod/.gitignore
index 2ec5558bb3..db34f6418f 100644
--- a/pod/.gitignore
+++ b/pod/.gitignore
@@ -53,7 +53,7 @@
 /roffitall
 
 # generated
-/perl5223delta.pod
+/perl5224delta.pod
 /perlapi.pod
 /perlintern.pod
 *.html
diff --git a/pod/perl.pod b/pod/perl.pod
index f6b7d79a87..c18db12598 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -180,6 +180,7 @@ aux c2ph h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp
 
     perlhist		Perl history records
     perldelta		Perl changes since previous version
+    perl5223delta	Perl changes in version 5.22.3
     perl5222delta	Perl changes in version 5.22.2
     perl5221delta	Perl changes in version 5.22.1
     perl5220delta	Perl changes in version 5.22.0
diff --git a/pod/perl5223delta.pod b/pod/perl5223delta.pod
new file mode 100644
index 0000000000..e1322b7eb4
--- /dev/null
+++ b/pod/perl5223delta.pod
@@ -0,0 +1,314 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5223delta - what is new for perl v5.22.3
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.22.2 release and the 5.22.3
+release.
+
+If you are upgrading from an earlier release such as 5.22.1, first read
+L<perl5222delta>, which describes differences between 5.22.1 and 5.22.2.
+
+=head1 Security
+
+=head2 B<-Di> switch is now required for PerlIO debugging output
+
+Previously PerlIO debugging output would be sent to the file specified by the
+C<PERLIO_DEBUG> environment variable if perl wasn't running setuid and the
+B<-T> or B<-t> switches hadn't been parsed yet.
+
+If perl performed output at a point where it hadn't yet parsed its switches
+this could result in perl creating or overwriting the file named by
+C<PERLIO_DEBUG> even when the B<-T> switch had been supplied.
+
+Perl now requires the B<-Di> switch to produce PerlIO debugging output.  By
+default this is written to C<stderr>, but can optionally be redirected to a
+file by setting the C<PERLIO_DEBUG> environment variable.
+
+If perl is running setuid or the B<-T> switch was supplied C<PERLIO_DEBUG> is
+ignored and the debugging output is sent to C<stderr> as for any other B<-D>
+switch.
+
+=head2 Core modules and tools no longer search F<"."> for optional modules
+
+The tools and many modules supplied in core no longer search the default
+current directory entry in L<C<@INC>|perlvar/@INC> for optional modules.  For
+example, L<Storable> will remove the final F<"."> from C<@INC> before trying to
+load L<Log::Agent>.
+
+This prevents an attacker injecting an optional module into a process run by
+another user where the current directory is writable by the attacker, e.g. the
+F</tmp> directory.
+
+In most cases this removal should not cause problems, but difficulties were
+encountered with L<base>, which treats every module name supplied as optional.
+These difficulties have not yet been resolved, so for this release there are no
+changes to L<base>.  We hope to have a fix for L<base> in Perl 5.22.4.
+
+To protect your own code from this attack, either remove the default F<".">
+entry from C<@INC> at the start of your script, so:
+
+  #!/usr/bin/perl
+  use strict;
+  ...
+
+becomes:
+
+  #!/usr/bin/perl
+  BEGIN { pop @INC if $INC[-1] eq '.' }
+  use strict;
+  ...
+
+or for modules, remove F<"."> from a localized C<@INC>, so:
+
+  my $can_foo = eval { require Foo; }
+
+becomes:
+
+  my $can_foo = eval {
+      local @INC = @INC;
+      pop @INC if $INC[-1] eq '.';
+      require Foo;
+  };
+
+=head1 Incompatible Changes
+
+Other than the security changes above there are no changes intentionally
+incompatible with Perl 5.22.2.  If any exist, they are bugs, and we request
+that you submit a report.  See L</Reporting Bugs> below.
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<Archive::Tar> has been upgraded from version 2.04 to 2.04_01.
+
+=item *
+
+L<bignum> has been upgraded from version 0.39 to 0.39_01.
+
+=item *
+
+L<CPAN> has been upgraded from version 2.11 to 2.11_01.
+
+=item *
+
+L<Digest> has been upgraded from version 1.17 to 1.17_01.
+
+=item *
+
+L<Digest::SHA> has been upgraded from version 5.95 to 5.95_01.
+
+=item *
+
+L<Encode> has been upgraded from version 2.72 to 2.72_01.
+
+=item *
+
+L<ExtUtils::Command> has been upgraded from version 1.20 to 1.20_01.
+
+=item *
+
+L<ExtUtils::MakeMaker> has been upgraded from version 7.04_01 to 7.04_02.
+
+=item *
+
+L<File::Fetch> has been upgraded from version 0.48 to 0.48_01.
+
+=item *
+
+L<File::Spec> has been upgraded from version 3.56_01 to 3.56_02.
+
+=item *
+
+L<HTTP::Tiny> has been upgraded from version 0.054 to 0.054_01.
+
+=item *
+
+L<IO> has been upgraded from version 1.35 to 1.35_01.
+
+=item *
+
+The IO-Compress modules have been upgraded from version 2.068 to 2.068_001.
+
+=item *
+
+L<IPC::Cmd> has been upgraded from version 0.92 to 0.92_01.
+
+=item *
+
+L<JSON::PP> has been upgraded from version 2.27300 to 2.27300_01.
+
+=item *
+
+L<Locale::Maketext> has been upgraded from version 1.26 to 1.26_01.
+
+=item *
+
+L<Locale::Maketext::Simple> has been upgraded from version 0.21 to 0.21_01.
+
+=item *
+
+L<Memoize> has been upgraded from version 1.03 to 1.03_01.
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.20160429 to 5.20170114_22.
+
+=item *
+
+L<Net::Ping> has been upgraded from version 2.43 to 2.43_01.
+
+=item *
+
+L<Parse::CPAN::Meta> has been upgraded from version 1.4414 to 1.4414_001.
+
+=item *
+
+L<Pod::Html> has been upgraded from version 1.22 to 1.2201.
+
+=item *
+
+L<Pod::Perldoc> has been upgraded from version 3.25 to 3.25_01.
+
+=item *
+
+L<Storable> has been upgraded from version 2.53_01 to 2.53_02.
+
+=item *
+
+L<Sys::Syslog> has been upgraded from version 0.33 to 0.33_01.
+
+=item *
+
+L<Test> has been upgraded from version 1.26 to 1.26_01.
+
+=item *
+
+L<Test::Harness> has been upgraded from version 3.35 to 3.35_01.
+
+=item *
+
+L<XSLoader> has been upgraded from version 0.20 to 0.20_01, fixing a security
+hole in which binary files could be loaded from a path outside of C<@INC>.
+L<[perl #128528]|https://rt.perl.org/Public/Bug/Display.html?id=128528>
+
+=back
+
+=head1 Documentation
+
+=head2 Changes to Existing Documentation
+
+=head3 L<perlapio>
+
+=over 4
+
+=item *
+
+The documentation of C<PERLIO_DEBUG> has been updated.
+
+=back
+
+=head3 L<perlrun>
+
+=over 4
+
+=item *
+
+The new B<-Di> switch has been documented, and the documentation of
+C<PERLIO_DEBUG> has been updated.
+
+=back
+
+=head1 Testing
+
+=over 4
+
+=item *
+
+A new test script, F<t/run/switchDx.t>, has been added to test that the new
+B<-Di> switch is working correctly.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+The C<PadlistNAMES> macro is an lvalue again.
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.22.3 represents approximately 9 months of development since Perl 5.22.2
+and contains approximately 4,400 lines of changes across 240 files from 20
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 2,200 lines of changes to 170 .pm, .t, .c and .h files.
+
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers.  The following people are known to have contributed
+the improvements that became Perl 5.22.3:
+
+Aaron Crane, Abigail, Alex Vandiver, Aristotle Pagaltzis, Chad Granum, Chris
+'BinGOs' Williams, Craig A. Berry, David Mitchell, Father Chrysostomos, James E
+Keenan, Jarkko Hietaniemi, Karen Etheridge, Karl Williamson, Matthew Horsfall,
+Niko Tyni, Ricardo Signes, Sawyer X, Stevan Little, Steve Hay, Tony Cook.
+
+The list above is almost certainly incomplete as it is automatically generated
+from version control history.  In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
+
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core.  We're grateful to the entire CPAN community for
+helping Perl to flourish.
+
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
+
+=head1 Reporting Bugs
+
+If you find what you think is a bug, you might check the articles recently
+posted to the comp.lang.perl.misc newsgroup and the Perl bug database at
+https://rt.perl.org/ .  There may also be information at http://www.perl.org/ ,
+the Perl Home Page.
+
+If you believe you have an unreported bug, please run the L<perlbug> program
+included with your release.  Be sure to trim your bug down to a tiny but
+sufficient test case.  Your bug report, along with the output of C<perl -V>,
+will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
+
+If the bug you are reporting has security implications, which make it
+inappropriate to send to a publicly archived mailing list, then please send it
+to perl5-security-report@perl.org.  This points to a closed subscription
+unarchived mailing list, which includes all the core committers, who will be
+able to help assess the impact of issues, figure out a resolution, and help
+co-ordinate the release of patches to mitigate or fix the problem across all
+platforms on which Perl is supported.  Please only use this address for
+security issues in the Perl core, not for modules independently distributed on
+CPAN.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view exhaustive details on
+what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut
diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 6923777d49..ca56bb08d9 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,288 +2,390 @@
 
 =head1 NAME
 
-perldelta - what is new for perl v5.22.3
+[ this is a template for a new perldelta file.  Any text flagged as XXX needs
+to be processed before release. ]
+
+perldelta - what is new for perl v5.22.4
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.22.2 release and the 5.22.3
+This document describes differences between the 5.22.3 release and the 5.22.4
 release.
 
-If you are upgrading from an earlier release such as 5.22.1, first read
-L<perl5222delta>, which describes differences between 5.22.1 and 5.22.2.
+If you are upgrading from an earlier release such as 5.22.2, first read
+L<perl5223delta>, which describes differences between 5.22.2 and 5.22.3.
+
+=head1 Notice
+
+XXX Any important notices here
+
+=head1 Core Enhancements
+
+XXX New core language features go here.  Summarize user-visible core language
+enhancements.  Particularly prominent performance optimisations could go
+here, but most should go in the L</Performance Enhancements> section.
+
+[ List each enhancement as a =head2 entry ]
 
 =head1 Security
 
-=head2 B<-Di> switch is now required for PerlIO debugging output
+XXX Any security-related notices go here.  In particular, any security
+vulnerabilities closed should be noted here rather than in the
+L</Selected Bug Fixes> section.
 
-Previously PerlIO debugging output would be sent to the file specified by the
-C<PERLIO_DEBUG> environment variable if perl wasn't running setuid and the
-B<-T> or B<-t> switches hadn't been parsed yet.
+[ List each security issue as a =head2 entry ]
 
-If perl performed output at a point where it hadn't yet parsed its switches
-this could result in perl creating or overwriting the file named by
-C<PERLIO_DEBUG> even when the B<-T> switch had been supplied.
+=head1 Incompatible Changes
 
-Perl now requires the B<-Di> switch to produce PerlIO debugging output.  By
-default this is written to C<stderr>, but can optionally be redirected to a
-file by setting the C<PERLIO_DEBUG> environment variable.
+XXX For a release on a stable branch, this section aspires to be:
 
-If perl is running setuid or the B<-T> switch was supplied C<PERLIO_DEBUG> is
-ignored and the debugging output is sent to C<stderr> as for any other B<-D>
-switch.
+    There are no changes intentionally incompatible with 5.XXX.XXX
+    If any exist, they are bugs, and we request that you submit a
+    report.  See L</Reporting Bugs> below.
 
-=head2 Core modules and tools no longer search F<"."> for optional modules
+[ List each incompatible change as a =head2 entry ]
 
-The tools and many modules supplied in core no longer search the default
-current directory entry in L<C<@INC>|perlvar/@INC> for optional modules.  For
-example, L<Storable> will remove the final F<"."> from C<@INC> before trying to
-load L<Log::Agent>.
+=head1 Deprecations
 
-This prevents an attacker injecting an optional module into a process run by
-another user where the current directory is writable by the attacker, e.g. the
-F</tmp> directory.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-In most cases this removal should not cause problems, but difficulties were
-encountered with L<base>, which treats every module name supplied as optional.
-These difficulties have not yet been resolved, so for this release there are no
-changes to L<base>.  We hope to have a fix for L<base> in Perl 5.22.4.
+=head2 Module removals
 
-To protect your own code from this attack, either remove the default F<".">
-entry from C<@INC> at the start of your script, so:
+XXX Remove this section if inapplicable.
 
-  #!/usr/bin/perl
-  use strict;
-  ...
+The following modules will be removed from the core distribution in a
+future release, and will at that time need to be installed from CPAN.
+Distributions on CPAN which require these modules will need to list them as
+prerequisites.
 
-becomes:
+The core versions of these modules will now issue C<"deprecated">-category
+warnings to alert you to this fact.  To silence these deprecation warnings,
+install the modules in question from CPAN.
 
-  #!/usr/bin/perl
-  BEGIN { pop @INC if $INC[-1] eq '.' }
-  use strict;
-  ...
+Note that these are (with rare exceptions) fine modules that you are encouraged
+to continue to use.  Their disinclusion from core primarily hinges on their
+necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
+not usually on concerns over their design.
 
-or for modules, remove F<"."> from a localized C<@INC>, so:
+=over
 
-  my $can_foo = eval { require Foo; }
+=item XXX
 
-becomes:
+XXX Note that deprecated modules should be listed here even if they are listed
+as an updated module in the L</Modules and Pragmata> section.
 
-  my $can_foo = eval {
-      local @INC = @INC;
-      pop @INC if $INC[-1] eq '.';
-      require Foo;
-  };
+=back
 
-=head1 Incompatible Changes
+[ List each other deprecation as a =head2 entry ]
 
-Other than the security changes above there are no changes intentionally
-incompatible with Perl 5.22.2.  If any exist, they are bugs, and we request
-that you submit a report.  See L</Reporting Bugs> below.
+=head1 Performance Enhancements
 
-=head1 Modules and Pragmata
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
 
-=head2 Updated Modules and Pragmata
+[ List each enhancement as a =item entry ]
 
 =over 4
 
 =item *
 
-L<Archive::Tar> has been upgraded from version 2.04 to 2.04_01.
+XXX
 
-=item *
+=back
 
-L<bignum> has been upgraded from version 0.39 to 0.39_01.
+=head1 Modules and Pragmata
 
-=item *
+XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
+go here.  If Module::CoreList is updated, generate an initial draft of the
+following sections using F<Porting/corelist-perldelta.pl>.  A paragraph summary
+for important changes should then be added by hand.  In an ideal world,
+dual-life modules would have a F<Changes> file that could be cribbed.
 
-L<CPAN> has been upgraded from version 2.11 to 2.11_01.
+[ Within each section, list entries as a =item entry ]
 
-=item *
+=head2 New Modules and Pragmata
 
-L<Digest> has been upgraded from version 1.17 to 1.17_01.
+=over 4
 
 =item *
 
-L<Digest::SHA> has been upgraded from version 5.95 to 5.95_01.
+XXX
 
-=item *
+=back
+
+=head2 Updated Modules and Pragmata
 
-L<Encode> has been upgraded from version 2.72 to 2.72_01.
+=over 4
 
 =item *
 
-L<ExtUtils::Command> has been upgraded from version 1.20 to 1.20_01.
+L<XXX> has been upgraded from version A.xx to B.yy.
 
-=item *
+=back
 
-L<ExtUtils::MakeMaker> has been upgraded from version 7.04_01 to 7.04_02.
+=head2 Removed Modules and Pragmata
+
+=over 4
 
 =item *
 
-L<File::Fetch> has been upgraded from version 0.48 to 0.48_01.
+XXX
 
-=item *
+=back
 
-L<File::Spec> has been upgraded from version 3.56_01 to 3.56_02.
+=head1 Documentation
 
-=item *
+XXX Changes to files in F<pod/> go here.  Consider grouping entries by
+file and be sure to link to the appropriate page, e.g. L<perlfunc>.
 
-L<HTTP::Tiny> has been upgraded from version 0.054 to 0.054_01.
+=head2 New Documentation
 
-=item *
+XXX Changes which create B<new> files in F<pod/> go here.
 
-L<IO> has been upgraded from version 1.35 to 1.35_01.
+=head3 L<XXX>
 
-=item *
+XXX Description of the purpose of the new file here
 
-The IO-Compress modules have been upgraded from version 2.068 to 2.068_001.
+=head2 Changes to Existing Documentation
 
-=item *
+XXX Changes which significantly change existing files in F<pod/> go here.
+However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
+section.
+
+=head3 L<XXX>
 
-L<IPC::Cmd> has been upgraded from version 0.92 to 0.92_01.
+=over 4
 
 =item *
 
-L<JSON::PP> has been upgraded from version 2.27300 to 2.27300_01.
+XXX Description of the change here
 
-=item *
+=back
 
-L<Locale::Maketext> has been upgraded from version 1.26 to 1.26_01.
+=head1 Diagnostics
 
-=item *
+The following additions or changes have been made to diagnostic output,
+including warnings and fatal error messages.  For the complete list of
+diagnostic messages, see L<perldiag>.
 
-L<Locale::Maketext::Simple> has been upgraded from version 0.21 to 0.21_01.
+XXX New or changed warnings emitted by the core's C<C> code go here.  Also
+include any changes in L<perldiag> that reconcile it to the C<C> code.
 
-=item *
+=head2 New Diagnostics
 
-L<Memoize> has been upgraded from version 1.03 to 1.03_01.
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
 
-=item *
+=head3 New Errors
 
-L<Module::CoreList> has been upgraded from version 5.20160429 to 5.20170114_22.
+=over 4
 
 =item *
 
-L<Net::Ping> has been upgraded from version 2.43 to 2.43_01.
+XXX L<message|perldiag/"message">
 
-=item *
+=back
 
-L<Parse::CPAN::Meta> has been upgraded from version 1.4414 to 1.4414_001.
+=head3 New Warnings
+
+=over 4
 
 =item *
 
-L<Pod::Html> has been upgraded from version 1.22 to 1.2201.
+XXX L<message|perldiag/"message">
 
-=item *
+=back
 
-L<Pod::Perldoc> has been upgraded from version 3.25 to 3.25_01.
+=head2 Changes to Existing Diagnostics
 
-=item *
+XXX Changes (i.e. rewording) of diagnostic messages go here
 
-L<Storable> has been upgraded from version 2.53_01 to 2.53_02.
+=over 4
 
 =item *
 
-L<Sys::Syslog> has been upgraded from version 0.33 to 0.33_01.
+XXX Describe change here
 
-=item *
+=back
 
-L<Test> has been upgraded from version 1.26 to 1.26_01.
+=head1 Utility Changes
 
-=item *
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
+
+[ List utility changes as a =head2 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
+
+=head2 L<XXX>
 
-L<Test::Harness> has been upgraded from version 3.35 to 3.35_01.
+=over 4
 
 =item *
 
-L<XSLoader> has been upgraded from version 0.20 to 0.20_01, fixing a security
-hole in which binary files could be loaded from a path outside of C<@INC>.
-L<[perl #128528]|https://rt.perl.org/Public/Bug/Display.html?id=128528>
+XXX
 
 =back
 
-=head1 Documentation
+=head1 Configuration and Compilation
 
-=head2 Changes to Existing Documentation
+XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
+go here.  Any other changes to the Perl build process should be listed here.
+However, any platform-specific changes should be listed in the
+L</Platform Support> section, instead.
 
-=head3 L<perlapio>
+[ List changes as a =item entry ].
 
 =over 4
 
 =item *
 
-The documentation of C<PERLIO_DEBUG> has been updated.
+XXX
 
 =back
 
-=head3 L<perlrun>
+=head1 Testing
+
+XXX Any significant changes to the testing of a freshly built perl should be
+listed here.  Changes which create B<new> files in F<t/> go here as do any
+large changes to the testing harness (e.g. when parallel testing was added).
+Changes to existing files in F<t/> aren't worth summarizing, although the bugs
+that they represent may be covered elsewhere.
+
+[ List each test improvement as a =item entry ]
 
 =over 4
 
 =item *
 
-The new B<-Di> switch has been documented, and the documentation of
-C<PERLIO_DEBUG> has been updated.
+XXX
 
 =back
 
-=head1 Testing
+=head1 Platform Support
+
+XXX Any changes to platform support should be listed in the sections below.
+
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
+
+=head2 New Platforms
+
+XXX List any platforms that this version of perl compiles on, that previous
+versions did not.  These will either be enabled by new files in the F<hints/>
+directories, or new subdirectories and F<README> files at the top level of the
+source tree.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head2 Discontinued Platforms
+
+XXX List any platforms that this version of perl no longer compiles on.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head2 Platform-Specific Notes
+
+XXX List any changes for specific platforms.  This could include configuration
+and compilation changes or changes in portability/compatibility.  However,
+changes within modules for platforms should generally be listed in the
+L</Modules and Pragmata> section.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head1 Internal Changes
+
+XXX Changes which affect the interface available to C<XS> code go here.  Other
+significant internal changes for future core maintainers should be noted as
+well.
+
+[ List each change as a =item entry ]
 
 =over 4
 
 =item *
 
-A new test script, F<t/run/switchDx.t>, has been added to test that the new
-B<-Di> switch is working correctly.
+XXX
 
 =back
 
 =head1 Selected Bug Fixes
 
+XXX Important bug fixes in the core language are summarized here.  Bug fixes in
+files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
+
+[ List each fix as a =item entry ]
+
 =over 4
 
 =item *
 
-The C<PadlistNAMES> macro is an lvalue again.
+XXX
 
 =back
 
-=head1 Acknowledgements
+=head1 Known Problems
 
-Perl 5.22.3 represents approximately 9 months of development since Perl 5.22.2
-and contains approximately 4,400 lines of changes across 240 files from 20
-authors.
+XXX Descriptions of platform agnostic bugs we know we can't fix go here.  Any
+tests that had to be C<TODO>ed for the release would be noted here.  Unfixed
+platform specific bugs also go here.
 
-Excluding auto-generated files, documentation and release tools, there were
-approximately 2,200 lines of changes to 170 .pm, .t, .c and .h files.
+[ List each fix as a =item entry ]
 
-Perl continues to flourish into its third decade thanks to a vibrant community
-of users and developers.  The following people are known to have contributed
-the improvements that became Perl 5.22.3:
+=over 4
+
+=item *
 
-Aaron Crane, Abigail, Alex Vandiver, Aristotle Pagaltzis, Chad Granum, Chris
-'BinGOs' Williams, Craig A. Berry, David Mitchell, Father Chrysostomos, James E
-Keenan, Jarkko Hietaniemi, Karen Etheridge, Karl Williamson, Matthew Horsfall,
-Niko Tyni, Ricardo Signes, Sawyer X, Stevan Little, Steve Hay, Tony Cook.
+XXX
 
-The list above is almost certainly incomplete as it is automatically generated
-from version control history.  In particular, it does not include the names of
-the (very much appreciated) contributors who reported issues to the Perl bug
-tracker.
+=back
+
+=head1 Errata From Previous Releases
+
+=over 4
+
+=item *
+
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
+
+=back
+
+=head1 Obituary
+
+XXX If any significant core contributor has died, we've added a short obituary
+here.
+
+=head1 Acknowledgements
 
-Many of the changes included in this version originated in the CPAN modules
-included in Perl's core.  We're grateful to the entire CPAN community for
-helping Perl to flourish.
+XXX Generate this with:
 
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+  perl Porting/acknowledgements.pl v5.22.3..HEAD
 
 =head1 Reporting Bugs
 
 If you find what you think is a bug, you might check the articles recently
-posted to the comp.lang.perl.misc newsgroup and the Perl bug database at
-https://rt.perl.org/ .  There may also be information at http://www.perl.org/ ,
-the Perl Home Page.
+posted to the comp.lang.perl.misc newsgroup and the perl bug database at
+https://rt.perl.org/ .  There may also be information at
+http://www.perl.org/ , the Perl Home Page.
 
 If you believe you have an unreported bug, please run the L<perlbug> program
 included with your release.  Be sure to trim your bug down to a tiny but
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index b8fea830cf..17dba9647d 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -307,7 +307,7 @@ utils : $(utils1) $(utils2) $(utils3) $(utils4) $(utils5)
 extra.pods : miniperl
 	@ @extra_pods.com
 
-PERLDELTA_CURRENT = [.pod]perl5223delta.pod
+PERLDELTA_CURRENT = [.pod]perl5224delta.pod
 
 $(PERLDELTA_CURRENT) : [.pod]perldelta.pod
 	Copy/NoConfirm/Log $(MMS$SOURCE) $(PERLDELTA_CURRENT)
diff --git a/win32/Makefile b/win32/Makefile
index 922dc15867..b8774ae5de 100644
--- a/win32/Makefile
+++ b/win32/Makefile
@@ -1176,7 +1176,7 @@ utils: $(PERLEXE) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5223delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5224delta.pod
 	cd ..\win32
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
@@ -1272,7 +1272,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5223delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5224delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/makefile.mk b/win32/makefile.mk
index 7b97ce5bf3..4251b1f589 100644
--- a/win32/makefile.mk
+++ b/win32/makefile.mk
@@ -1468,7 +1468,7 @@ utils: $(PERLEXE) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5223delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5224delta.pod
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1563,7 +1563,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5223delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5224delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/pod.mak b/win32/pod.mak
index 820dd92abd..c253a4387f 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -44,6 +44,7 @@ POD = perl.pod	\
 	perl5221delta.pod	\
 	perl5222delta.pod	\
 	perl5223delta.pod	\
+	perl5224delta.pod	\
 	perl561delta.pod	\
 	perl56delta.pod	\
 	perl581delta.pod	\
@@ -182,6 +183,7 @@ MAN = perl.man	\
 	perl5221delta.man	\
 	perl5222delta.man	\
 	perl5223delta.man	\
+	perl5224delta.man	\
 	perl561delta.man	\
 	perl56delta.man	\
 	perl581delta.man	\
@@ -320,6 +322,7 @@ HTML = perl.html	\
 	perl5221delta.html	\
 	perl5222delta.html	\
 	perl5223delta.html	\
+	perl5224delta.html	\
 	perl561delta.html	\
 	perl56delta.html	\
 	perl581delta.html	\
@@ -458,6 +461,7 @@ TEX = perl.tex	\
 	perl5221delta.tex	\
 	perl5222delta.tex	\
 	perl5223delta.tex	\
+	perl5224delta.tex	\
 	perl561delta.tex	\
 	perl56delta.tex	\
 	perl581delta.tex	\