New perldelta for 5.41.10

Author: richardleach

MANIFEST

@@ -5751,6 +5751,7 @@ pod/perl5415delta.pod			Perl changes in version 5.41.5
 pod/perl5416delta.pod			Perl changes in version 5.41.6
 pod/perl5417delta.pod			Perl changes in version 5.41.7
 pod/perl5418delta.pod			Perl changes in version 5.41.8
+pod/perl5419delta.pod			Perl changes in version 5.41.9
 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

Makefile.SH

@@ -627,7 +627,7 @@ esac
 
 $spitshell >>$Makefile <<'!NO!SUBS!'
 
-perltoc_pod_prereqs = extra.pods pod/perl5419delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl54110delta.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
 
@@ -1136,9 +1136,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) pod/perlmodlib.PL -q
 
-pod/perl5419delta.pod: pod/perldelta.pod
-	$(RMS) pod/perl5419delta.pod
-	$(LNS) perldelta.pod pod/perl5419delta.pod
+pod/perl54110delta.pod: pod/perldelta.pod
+	$(RMS) pod/perl54110delta.pod
+	$(LNS) perldelta.pod pod/perl54110delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`

pod/.gitignore

@@ -47,7 +47,7 @@
 /roffitall
 
 # generated
-/perl5419delta.pod
+/perl54110delta.pod
 /perlapi.pod
 /perlintern.pod
 /perlmodlib.pod

pod/perl.pod

@@ -181,6 +181,7 @@ aux h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp
 
     perlhist            Perl history records
     perldelta           Perl changes since previous version
+    perl5419delta       Perl changes in version 5.41.9
     perl5418delta       Perl changes in version 5.41.8
     perl5417delta       Perl changes in version 5.41.7
     perl5416delta       Perl changes in version 5.41.6

pod/perl5419delta.pod

@@ -0,0 +1,340 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5419delta - what is new for perl v5.41.9
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.41.8 release and the 5.41.9
+release.
+
+If you are upgrading from an earlier release such as 5.41.7, first read
+L<perl5418delta>, which describes differences between 5.41.7 and 5.41.8.
+
+=head1 Core Enhancements
+
+=head2 Lexical method declaration using C<my method>
+
+Like C<sub> since Perl version 5.18, C<method> can now be prefixed with the
+C<my> keyword.  This declares a subroutine that has lexical, rather than
+package visibility.  See L<perlclass> for more detail.
+
+=head2 Lexical method invocation operator C<< ->& >>
+
+Along with the ability to declare methods lexically, this release also permits
+invoking a lexical subroutine as if it were a method, bypassing the usual
+name-based method resolution by name.
+
+Combined with lexical method declaration, these two new abilities create the
+effect of having private methods.
+
+=head1 Incompatible Changes
+
+=head2 Switch and Smart Match operator reinstated
+
+The "switch" feature and the smartmatch operator, C<~~>, were introduced in
+v5.10.  Their behavior was significantly changed in v5.10.1.  When the
+"experiment" system was added in v5.18.0, switch and smartmatch were
+retroactively declared experimental.  Over the years, proposals to fix or
+supplement the features have come and gone.
+
+They were deprecated in Perl v5.38.0 and scheduled for removal in Perl
+5.42.0, and entirely removed in Perl 5.41.3.
+
+After some discussion these have been re-instated.
+
+Using them no longer produces a deprecation warning.
+
+Switch itself still requires the C<switch> feature, which is enabled
+by default for feature bundles from v5.9.5 through to v5.34.  Switch
+remains disabled in feature bundles 5.35 and later, but can be
+separately enabled:
+
+  # no switch here
+  use v5.10;
+  # switch here
+  use v5.36;
+  # no switch here
+  use feature "switch";
+  # switch here
+
+Smart match now requires the C<smartmatch> feature, which is enabled
+by default and included in all feature bundles up to 5.40.  It is
+disabled for the 5.41 feature bundle and later, but can be separately
+enabled:
+
+  # smartmatch here
+  use v5.41;
+  # no smartmatch here
+  use feature "smartmatch";
+  # smartmatch here
+
+[L<GH #22752|https://github.com/Perl/perl5/issues/22752>]
+
+=head1 Performance Enhancements
+
+=over 4
+
+=item *
+
+The stringification of integers by L<perlfunc/print> and L<perlfunc/say>,
+when coming from an C<SVt_IV>, is now more efficient.
+[L<GH #22927|https://github.com/Perl/perl5/issues/22927>]
+
+=item *
+
+Subroutines in packages no longer need to be stored in typeglobs:
+declaring a subroutine will now put a simple sub reference directly in the
+stash if possible, saving memory.  The typeglob still notionally exists,
+so accessing it will cause the stash entry to be upgraded to a typeglob
+(i.e. this is just an internal implementation detail).
+This optimization does not currently apply to XSUBs or exported
+subroutines, and method calls will undo it, since they cache things in
+typeglobs. 
+[L<GH #23001|https://github.com/Perl/perl5/issues/23001>]
+
+(This optimization was originally announced in L<perl5220delta>, but due to a
+bug it only worked for subroutines in package C<main>, not in modules.)
+
+=back
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<B::Deparse> has been upgraded from version 1.82 to 1.83.
+
+=item *
+
+L<Exporter> has been upgraded from version 5.78 to 5.79.
+
+=item *
+
+L<feature> has been upgraded from version 1.93 to 1.94.
+
+=item *
+
+L<Math::BigInt> has been upgraded from version 2.003003 to 2.003004.
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.20250120 to 5.20250220.
+
+=item *
+
+L<ODBM_File> has been upgraded from version 1.19 to 1.20.
+
+=item *
+
+L<Opcode> has been upgraded from version 1.68 to 1.69.
+
+=item *
+
+L<overload> has been upgraded from version 1.39 to 1.40.
+
+=item *
+
+L<Safe> has been upgraded from version 2.47 to 2.46.
+
+=item *
+
+L<Test::Simple> has been upgraded from version 1.302207 to 1.302209.
+
+=item *
+
+L<Unicode::UCD> has been upgraded from version 0.78 to 0.79.
+
+=item *
+
+L<warnings> has been upgraded from version 1.72 to 1.73.
+
+=back
+
+=head1 Diagnostics
+
+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>.
+
+=head2 New Diagnostics
+
+=head3 New Errors
+
+=over 4
+
+=item *
+
+L<Undefined subroutine &%s called, close to label '%s'|perldiag/"Undefined subroutine &%s called, close to label '%s'">
+
+(F) The subroutine indicated hasn't been defined, or if it was, it has
+since been undefined.
+
+This error could also indicate a mistyped package separator, when a
+single colon was typed instead of two colons. For example, C<Foo:bar()>
+would be parsed as the label C<Foo> followed by an unqualified function
+name: C<foo: bar()>. [L<GH #22860|https://github.com/Perl/perl5/issues/22860>]
+
+=back
+
+=head2 Changes to Existing Diagnostics
+
+=over 4
+
+=item *
+
+L<Possible precedence problem between ! and %s|perldiag/"Possible precedence problem between ! and %s">
+
+This warning no longer triggers for code like C<!!$x == $y>, i.e. where double
+negation (C<!!>) is used as a convert-to-boolean operator.
+[L<GH #22954|https://github.com/Perl/perl5/issues/22954>]
+
+=item *
+
+L<Useless use of %s in void context|perldiag/"Useless use of %s in void context">
+
+This warning now triggers for use of a chained comparison like C<< 0 < $x < 1 >>.
+[L<GH #22969|https://github.com/Perl/perl5/issues/22969>]
+
+=back
+
+=head1 Internal Changes
+
+=over 4
+
+=item *
+
+Two new API functions are introduced to convert strings encoded in
+native bytes format to UTF-8.  These return the string unchanged if its
+UTF-8 representation is the same as the original.  Otherwise, new memory
+is allocated to contain the converted string.  This is in contrast to
+the existing L<perlapi/C<bytes_to_utf8>> which always allocates new
+memory.  The new functions are L<perlapi/C<bytes_to_utf8_free_me>> and
+L<perlapi/C<bytes_to_utf8_temp_pv>>.
+L<perlapi/C<bytes_to_utf8_temp_pv>> arranges for the new memory to
+automatically be freed.  With C<bytes_to_utf8_free_me>, you are
+responsible for freeing any newly allocated memory.
+
+=item *
+
+The way that subroutine signatures are parsed by the parser grammar has been
+changed.
+
+Previously, when parsing individual signature parameters, the parser would
+accumulate an C<OP_ARGELEM> optree fragment for each parameter on the parser
+stack, collecting them in an C<OP_LIST> sequence, before finally building the
+complete argument handling optree itself, in a large action block defined
+directly in F<perly.y>.
+
+In the new approach, all the optree generation is handled by newly-defined
+functions in F<op.c> which are called by the action blocks in the parser.
+These do not keep state on the parser stack, but instead in a dedicated memory
+structure referenced by the main C<PL_parser> structure.  This is intended to
+be largely opaque to other code, and accessed only via the new functions.
+
+This new arrangement is intended to allow more flexible code generation and
+additional features to be developed in future.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+The C<$SIG{__DIE__}> and C<$SIG{__WARN__}> handlers can no longer be invoked
+recursively, either deliberately or by accident, as described in
+L<perlvar/%SIG>. That is, when an exception (or warning) triggers a call to a
+C<$SIG{__DIE__}> (or C<$SIG{__WARN__}>) handler, further exceptions (or
+warnings) are processed directly, ignoring C<%SIG> until the original
+C<$SIG{__DIE__}> (or C<$SIG{__WARN__}>) handler call returns.
+[L<GH #14527|https://github.com/Perl/perl5/issues/14527>], [L<GH #22984|https://github.com/Perl/perl5/issues/22984>], [L<GH #22987|https://github.com/Perl/perl5/issues/22987>]
+
+=item *
+
+The C<ObjectFIELDS()> for an object and C<xhv_class_fields> for the
+object's stash weren't always NULL or not-NULL, confusing C<sv_dump()>
+(and hence Devel::Peek's C<Dump()>) into crashing on an object with no
+defined fields in some cases.  [L<GH #22959|https://github.com/Perl/perl5/issues/22959>]
+
+=item *
+
+When comparing strings when using a UTF-8 locale, the behavior was
+previously undefined if either or both contained an above-Unicode code
+point, such as 0x110000.  Now all such code points will collate the same
+as the highest Unicode code point, U+10FFFF. [L<GH #22989|https://github.com/Perl/perl5/issues/22989>]
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.41.9 represents approximately 5 weeks of development since Perl
+5.41.8 and contains approximately 17,000 lines of changes across 380 files
+from 23 authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 9,700 lines of changes to 300 .pm, .t, .c and .h files.
+
+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 5.41.9:
+
+Andrew Ruthven, Antanas Vaitkus, Aristotle Pagaltzis, Chris 'BinGOs'
+Williams, Dan Book, Dan Jacobson, David Mitchell, Eric Herman, hbmaclean,
+James E Keenan, Karl Williamson, Leon Timmermans, Lukas Mai, Paul Evans,
+Peter John Acklam, Reini Urban, Richard Leach, Scott Baker, Steve Hay, TAKAI
+Kousuke, Thibault Duponchelle, Tony Cook, Yves Orton.
+
+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 perl bug database
+at L<https://github.com/Perl/perl5/issues>. There may also be information at
+L<https://www.perl.org/>, the Perl Home Page.
+
+If you believe you have an unreported bug, please open an issue at
+L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
+tiny but sufficient test case.
+
+If the bug you are reporting has security implications which make it
+inappropriate to send to a public issue tracker, then see
+L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
+for details of how to report the issue.
+
+=head1 Give Thanks
+
+If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
+you can do so by running the C<perlthanks> program:
+
+    perlthanks
+
+This will send an email to the Perl 5 Porters list with your show of thanks.
+
+=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