Perldelta for 5.33.9

1 files changed, 63 insertions, 278 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 9152c479b9..a1efc33155 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 v5.33.9
 
 =head1 DESCRIPTION
@@ -15,134 +12,44 @@ release.
 If you are upgrading from an earlier release such as 5.33.7, first read
 L<perl5338delta>, which describes differences between 5.33.7 and 5.33.8.
 
-=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 ]
-
-=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.
+=head1 Modules and Pragmata
 
-[ List each enhancement as an =item entry ]
+=head2 Updated Modules and Pragmata
 
 =over 4
 
 =item *
 
-XXX
-
-=back
-
-=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.
+L<perlfaq> has been upgraded from version 5.20201107 to 5.20210411.
 
-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.)
+- Added entry to faq4 for equivalent to ruby #{}, python fstring
 
-[ Within each section, list entries as an =item entry ]
+=item *
 
-=head2 New Modules and Pragmata
+L<ExtUtils::MakeMaker> has been upgraded from version 7.60 to 7.62
 
-=over 4
+- Now using shellwords in ExtUtils::Liblist::Kid::_unix_os2_ext
 
 =item *
 
-XXX Remove this section if not applicable.
+L<NEXT> has been upgraded from version 0.67 to 0.68
 
-=back
-
-=head2 Updated Modules and Pragmata
-
-=over 4
+- This aligns NEXT with changes already shipped with Perl as well as improving the test suite.
 
 =item *
 
-L<XXX> has been upgraded from version A.xx to B.yy.
+L<ExtUtils::ParseXS> has been upgraded from version 3.42 to 3.43
 
-If there was something important to note about this change, include that here.
+- Emphasize SvPVbyte and SvPVutf8 over SvPV in docs. Also includes minor output changes to clarify failure conditions.
 
 =back
 
-=head2 Removed Modules and Pragmata
+=head1 Documentation
 
 =over 4
 
 =item *
 
-XXX
-
-=back
-
-=head1 Documentation
-
 L<perlguts> now explains in greater detail the need to consult SvUTF8
 when calling SvPV (or variants). A new "How do I pass a Perl string to a C
 library?" section in the same document discusses when to use which style of
@@ -151,33 +58,28 @@ macro to read an SV's string value.
 L<perlapi>, L<perlguts>, L<perlxs>, and L<perlxstut> now prefer SvPVbyte
 over SvPV.
 
-=head2 New Documentation
+=item *
 
-XXX Changes which create B<new> files in F<pod/> go here.
+References to B<Pumpking> have been replaced with a more accurate term or B<Steering Council> where appropriate.
 
-=head3 L<XXX>
+=item *
 
-XXX Description of the purpose of the new file here
+L<perldiag> now documents additional examples of "not imported" warnings.
 
-=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, open an issue
-at L<https://github.com/Perl/perl5/issues>.
+B<The Perl Steering Council> is now the fallback contact for security issues.
 
-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:
+Simplify the split() documentation by removing the join()s from the examples (#18676)
 
-=head3 L<XXX>
+Remove join() from split() examples as it confuses the concepts
 
-=over 4
-
-=item *
-
-XXX Description of the change here
+split() is a very basic function, and the documentation should be
+simple for novinces. The split() documentation contains a lot of join()
+in the examples which only serve to muddle the concepts. This replaces
+the join() in the example with output in comments.
 
 =back
 
@@ -187,24 +89,8 @@ 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
@@ -218,124 +104,32 @@ provoke this warning.
 
 =back
 
-=head2 Changes to Existing Diagnostics
-
-XXX Changes (i.e. rewording) of diagnostic messages go here
+=head1 Configuration and Compilation
 
 =over 4
 
 =item *
 
-XXX Describe change here
-
-=back
-
-=head1 Utility Changes
-
-XXX Changes to installed programs such as F<perldoc> 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>
+Prevented incpath to spill into libpth
 
 =over 4
 
-=item *
-
-XXX
-
-=back
-
-=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.
+=item - Use realpath if available.
 
-[ List changes as an =item entry ].
+=item - This might catch more duplicate paths.
 
-=over 4
+=item - Only include real existing paths.
 
-=item *
-
-XXX
+=item - Filter inc paths out of libpth.
 
 =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 Windows
@@ -349,12 +143,6 @@ problem has been implemented.
 
 =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 *
@@ -383,14 +171,18 @@ resulting in undefined behaviour.
 
 These functions now correctly accept doubles, long doubles and NVs.
 
-=back
+=item *
 
-=head1 Selected Bug Fixes
+Previously the right operand of bitwise shift operators (shift amount)
+was implicitly cast from IV to int, but it might lead wrong results
+if IV does not fit in int.
+
+And also, shifting INT_MIN bits used to yield the shiftee unchanged
+(treated as 0-bit shift instead of negative shift).
 
-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>.
+=back
 
-[ List each fix as an =item entry ]
+=head1 Selected Bug Fixes
 
 =over 4
 
@@ -403,43 +195,36 @@ if that fails then warn and use the utf8 form.
 
 =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 5.33.9 represents approximately 4 weeks of development since Perl
+5.33.8 and contains approximately 3,900 lines of changes across 190 files
+from 23 authors.
 
-=back
+Excluding auto-generated files, documentation and release tools, there were
+approximately 780 lines of changes to 82 .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 5.33.9:
 
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
+Dan Book, Dominic Hamon, E. Choroba, Ed J, Felipe Gasper, H.Merijn Brand,
+Hugo van der Sanden, James E Keenan, John Lightsey, Karen Etheridge, Karl
+Williamson, Marc Reisner, Max Maischein, Nicolas R., Paul Evans, Ricardo
+Signes, Richard Leach, Scott Baker, TAKAI Kousuke, Todd Rinaldo, Tomasz
+Konojacki, Tony Cook, Михаил Козачков.
 
-=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 v5.33.8..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