Update perldelta for 5.31.4

1 files changed, 47 insertions, 265 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 45c20df9d6..0594af90e3 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 v5.31.4
 
 =head1 DESCRIPTION
@@ -17,16 +14,10 @@ L<perl5313delta>, which describes differences between 5.31.2 and 5.31.3.
 
 =head1 Notice
 
-XXX Any important notices here
+I<None>
 
 =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 Now can dump compiled patterns before optimization
 
 This is primarily useful for tracking down bugs in the regular
@@ -36,101 +27,55 @@ compiled within the scope of S<C<use re qw(Debug DUMP_PRE_OPTIMIZE)>> or
 S<C<use re qw(Debug COMPILE EXTRA)>>.  (All but the 2nd case display
 other information as well.)
 
-=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
+    There are no changes intentionally incompatible with 5.31.3
     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.
+I<None>
 
-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.
+=head1 Performance Enhancements
 
-=back
+I<None>
 
-[ List each other deprecation as a =head2 entry ]
+=head1 Modules and Pragmata
 
-=head1 Performance Enhancements
+=head2 New Modules and Pragmata
 
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
+I<None>
 
-[ List each enhancement as an =item entry ]
+=head2 Updated Modules and Pragmata
 
 =over 4
 
 =item *
 
-XXX
+L<ExtUtils::MakeMaker> has been upgraded from version 7.36 to 7.38.
 
-=back
+=item *
 
-=head1 Modules and Pragmata
+L<I18N::Langinfo> has been upgraded from version 0.18 to 0.19.
 
-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.
+=item *
 
-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.)
+L<Module::CoreList> has been upgraded from version 5.20190820 to 5.20190920.
 
-[ Within each section, list entries as an =item entry ]
+=item *
 
-=head2 New Modules and Pragmata
-
-=over 4
+L<Module::Metadata> has been upgraded from version 1.000036 to 1.000037.
 
 =item *
 
-XXX Remove this section if not applicable.
-
-=back
+L<re> has been upgraded from version 0.37 to 0.38.
 
-=head2 Updated Modules and Pragmata
+=item *
 
-=over 4
+L<Scalar::Util> has been upgraded from version 1.50 to 1.52.
 
 =item *
 
@@ -138,34 +83,17 @@ L<Test::Simple> has been upgraded from version 1.302166 to 1.302168.
 
 =item *
 
-L<XXX> has been upgraded from version A.xx to B.yy.
-
-If there was something important to note about this change, include that here.
-
-=back
-
-=head2 Removed Modules and Pragmata
-
-=over 4
+L<Time::HiRes> has been upgraded from version 1.9762 to 1.9763.
 
 =item *
 
-XXX
+L<XS::APItest> has been upgraded from version 1.02 to 1.03.
 
 =back
 
-=head1 Documentation
-
-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>.
-
-=head2 New Documentation
-
-XXX Changes which create B<new> files in F<pod/> go here.
-
-=head3 L<XXX>
+=head2 Removed Modules and Pragmata
 
-XXX Description of the purpose of the new file here
+I<None>
 
 =head2 Changes to Existing Documentation
 
@@ -173,10 +101,6 @@ 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>.
 
-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.
-
 Additionally, the following selected changes have been made:
 
 =head3 L<perlapi>, L<perlintern>
@@ -196,74 +120,12 @@ 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 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.
-
 =head2 New Diagnostics
 
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
-
-=head3 New Errors
-
-=over 4
-
-=item *
-
-XXX L<message|perldiag/"message">
-
-=back
-
-=head3 New Warnings
-
-=over 4
-
-=item *
-
-XXX L<message|perldiag/"message">
-
-=back
-
-=head2 Changes to Existing Diagnostics
-
-XXX Changes (i.e. rewording) of diagnostic messages go here
-
-=over 4
-
-=item *
-
-XXX Describe change here
-
-=back
-
-=head1 Utility Changes
-
-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>
-
-=over 4
-
-=item *
-
-XXX
-
-=back
+I<None>
 
 =head1 Configuration and Compilation
 
-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.
-
-[ List changes as an =item entry ].
-
 =over 4
 
 =item *
@@ -271,82 +133,17 @@ L</Platform Support> section, instead.
 Improvements in F<Configure> to detection in C++ and clang++.  Work ongoing by
 Andy Dougherty. [perl #134171]
 
-=item *
-
-XXX
-
 =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 *
-
-XXX
-
-=back
-
 =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
-
-=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 Win32
@@ -362,12 +159,6 @@ decode it as UTF-8.  [perl #133981]
 
 =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 *
@@ -382,11 +173,6 @@ context stack.
 
 =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 *
@@ -413,41 +199,37 @@ C<0b> prefix.  [perl #125557]
 
 =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
+I<None>
 
-=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 5.31.4 represents approximately 4 weeks of development since Perl
+5.31.3 and contains approximately 6,700 lines of changes across 260 files
+from 18 authors.
 
-=back
+Excluding auto-generated files, documentation and release tools, there were
+approximately 3,900 lines of changes to 180 .pm, .t, .c and .h files.
 
-=head1 Obituary
+Perl continues to flourish into its fourth decade thanks to a vibrant
+community of users and developers. The following people are known to have
+contributed the improvements that became Perl 5.31.4:
 
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
+Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dan Book, David
+Mitchell, Florian Weimer, Hauke D, H.Merijn Brand, James E Keenan, Kang-min
+Liu, Karl Williamson, Max Maischein, Pali, Sisyphus, Tomasz Konojacki, Tom
+Hukins, Tony Cook, VanL.
 
-=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 v5.31.3..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