finalize perldelta for 5.27.9

1 files changed, 80 insertions, 261 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index e7260c7036..22ce5fc880 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,9 +2,6 @@
 
 =head1 NAME
 
-[ 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 v5.27.9
 
 =head1 DESCRIPTION
@@ -15,18 +12,8 @@ release.
 If you are upgrading from an earlier release such as 5.27.7, first read
 L<perl5278delta>, which describes differences between 5.27.7 and 5.27.8.
 
-=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 ]
-
 =head2 New read-only predefined variable C<${^SAFE_LOCALES}>
 
 This variable is 1 if the Perl interpreter is operating in an
@@ -81,64 +68,8 @@ These are considered experimental, so using any of these will raise
 (unless turned off) a warning in the C<experimental::alpha_assertions>
 category.
 
-=head1 Security
-
-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.
-
-[ List each security issue as a =head2 entry ]
-
-=head1 Incompatible Changes
-
-XXX For a release on a stable branch, this section aspires to be:
-
-    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.
-
-[ List each incompatible change as a =head2 entry ]
-
-=head1 Deprecations
-
-XXX Any deprecated features, syntax, modules etc. should be listed here.
-
-=head2 Module removals
-
-XXX Remove this section if not applicable.
-
-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.
-
-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.
-
-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.
-
-=over
-
-=item XXX
-
-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.
-
-=back
-
-[ List each other deprecation as a =head2 entry ]
-
 =head1 Performance Enhancements
 
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
-
-[ List each enhancement as an =item entry ]
-
 =over 4
 
 =item *
@@ -157,194 +88,139 @@ not typically a major factor in most applications.
 
 =head1 Modules and Pragmata
 
-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.
-
-The list of new and updated modules is modified automatically as part of
-preparing a Perl release, so the only reason to manually add entries here is if
-you're summarising the important changes in the module update. (Also, if the
-manually-added details don't match the automatically-generated ones, the
-release manager will have to investigate the situation carefully.)
-
-[ Within each section, list entries as an =item entry ]
-
-=head2 New Modules and Pragmata
-
-=over 4
-
-=item *
-
-XXX Remove this section if not applicable.
-
-=back
-
 =head2 Updated Modules and Pragmata
 
 =over 4
 
 =item *
 
-L<XXX> has been upgraded from version A.xx to B.yy.
+L<bignum> has been upgraded from version 0.47 to 0.49.
 
-If there was something important to note about this change, include that here.
+=item *
 
-=back
+L<Carp> has been upgraded from version 1.45 to 1.46.
 
-=head2 Removed Modules and Pragmata
+=item *
 
-=over 4
+L<Devel::PPPort> has been upgraded from version 3.38 to 3.39.
 
 =item *
 
-XXX
+L<Encode> has been upgraded from version 2.94 to 2.96.
 
-=back
-
-=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<encoding> has been upgraded from version 2.21 to 2.22.
 
-=head2 New Documentation
+=item *
 
-XXX Changes which create B<new> files in F<pod/> go here.
+L<Errno> has been upgraded from version 1.28 to 1.29.
 
-=head3 L<XXX>
+=item *
 
-XXX Description of the purpose of the new file here
+L<ExtUtils::MakeMaker> has been upgraded from version 7.30 to 7.32.
 
-=head2 Changes to Existing Documentation
+=item *
 
-We have attempted to update the documentation to reflect the changes
-listed in this document.  If you find any we have missed, send email
-to L<perlbug@perl.org|mailto:perlbug@perl.org>.
+L<ExtUtils::ParseXS> has been upgraded from version 3.36 to 3.38.
 
-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.
+=item *
 
-Additionally, the following selected changes have been made:
+L<ExtUtils::Typemaps> has been upgraded from version 3.37 to 3.38.
 
-=head3 L<XXX>
+=item *
 
-=over 4
+L<File::Spec> has been upgraded from version 3.72 to 3.74.
 
 =item *
 
-XXX Description of the change here
+L<if> has been upgraded from version 0.0607 to 0.0608.
 
-=back
+=item *
 
-=head1 Diagnostics
+L<IPC::Cmd> has been upgraded from version 0.98 to 1.00.
 
-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>.
+=item *
 
-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.
+L<Module::CoreList> has been upgraded from version 5.20180120 to 5.20180220.
 
-=head2 New Diagnostics
+=item *
 
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
+L<mro> has been upgraded from version 1.21 to 1.22.
 
-=head3 New Errors
+=item *
 
-=over 4
+L<PerlIO::encoding> has been upgraded from version 0.25 to 0.26.
 
 =item *
 
-XXX L<message|perldiag/"message">
+L<POSIX> has been upgraded from version 1.81 to 1.82.
 
-=back
+=item *
 
-=head3 New Warnings
-
-=over 4
+L<Storable> has been upgraded from version 2.65 to 3.06.
 
 =item *
 
-L<Locale '%s' contains (at least) the following characters which have
-non-standard meanings: %s  The Perl program will use the standard
-meanings|perldiag/"Locale '%s' contains (at least) the following
-characters which have non-standard meanings: %s  The Perl program will
-use the standard meanings">.
+L<Test::Simple> has been upgraded from version 1.302120 to 1.302122.
 
-=back
+=item *
 
-=head2 Changes to Existing Diagnostics
+L<threads> has been upgraded from version 2.21 to 2.22.
 
-XXX Changes (i.e. rewording) of diagnostic messages go here
+=item *
 
-=over 4
+L<Time::HiRes> has been upgraded from version 1.9752 to 1.9753.
 
 =item *
 
-XXX Describe change here
+L<warnings> has been upgraded from version 1.40 to 1.41.
 
-=back
+=item *
 
-=head1 Utility Changes
+L<XXX> has been upgraded from version A.xx to B.yy.
 
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
+If there was something important to note about this change, include that here.
 
-[ 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. ]
+=back
 
-=head2 L<XXX>
+=head1 Documentation
 
-=over 4
 
-=item *
+=head2 Changes to Existing Documentation
 
-XXX
+We have attempted to update the documentation to reflect the changes
+listed in this document.  If you find any we have missed, send email
+to L<perlbug@perl.org|mailto:perlbug@perl.org>.
 
-=back
+=head1 Diagnostics
 
-=head1 Configuration and Compilation
+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>.
 
-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.
+=head2 New Diagnostics
 
-[ List changes as an =item entry ].
+=head3 New Warnings
 
 =over 4
 
 =item *
 
-XXX
+L<Locale '%s' contains (at least) the following characters which have
+non-standard meanings: %s  The Perl program will use the standard
+meanings|perldiag/"Locale '%s' contains (at least) the following
+characters which have non-standard meanings: %s  The Perl program will
+use the standard meanings">.
 
 =back
 
 =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.
-
-XXX If there were no significant test changes, say this:
-
-Tests were added and changed to reflect the other additions and changes
-in this release.
-
-XXX If instead there were significant changes, say this:
-
 Tests were added and changed to reflect the other additions and
 changes in this release.  Furthermore, these significant changes were
 made:
 
-[ List each test improvement as an =item entry ]
-
 =over 4
 
 =item *
@@ -356,23 +232,10 @@ F<t/io/openpid.t>.  [perl #121028][perl #132867]
 
 =head1 Platform Support
 
-XXX Any changes to platform support should be listed in the sections below.
-
-[ Within the sections, list each platform as an =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
 
 =item VMS
 
@@ -382,41 +245,8 @@ to set features after image initialization were ignored.
 
 =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 an =item entry ]
-
 =over 4
 
 =item *
@@ -452,11 +282,6 @@ with their arrays when the array is shifted or unshifted.  [perl #132729]
 
 =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 an =item entry ]
-
 =over 4
 
 =item *
@@ -480,43 +305,37 @@ doesn't come up on those with thread-safe locales.
 
 =back
 
-=head1 Known Problems
-
-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.
-
-[ List each fix as an =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
-
-=head1 Errata From Previous Releases
-
-=over 4
-
-=item *
+=head1 Acknowledgements
 
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+Perl 5.27.9 represents approximately 5 weeks of development since Perl
+5.27.8 and contains approximately 29,000 lines of changes across 360 files
+from 26 authors.
 
-=back
+Excluding auto-generated files, documentation and release tools, there were
+approximately 13,000 lines of changes to 250 .pm, .t, .c and .h files.
 
-=head1 Obituary
+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 5.27.9:
 
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
+, Aaron Crane, Abigail, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn
+Ilmari Mannsåker, David Mitchell, Father Chrysostomos, George Hartzell,
+H.Merijn Brand, Hugo van der Sanden, James E Keenan, Jerry D. Hedden, Karl
+Williamson, Matthew Horsfall, Pali, Reini Urban, Sawyer X, Slaven Rezic,
+Steve Hay, Todd Rinaldo, Tomasz Konojacki, Tom Wyant, Tony Cook, Yves Orton,
+Zefram.
 
-=head1 Acknowledgements
+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.
 
-XXX Generate this with:
+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.
 
-  perl Porting/acknowledgements.pl v5.27.8..HEAD
+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