=encoding utf8

=head1 NAME

perl5411delta - what is new for perl v5.41.1

=head1 DESCRIPTION

This document describes differences between the 5.41.0 release and the 5.41.1
release.

If you are upgrading from an earlier release such as 5.40.0, first read
L<perl5410delta>, which describes differences between 5.40.0 and 5.41.0.

=head1 Core Enhancements

=head2 More CORE:: subs

C<chdir> has been added as a subroutine to the CORE:: namespace.

Previously, code like C<&CORE::chdir($dir)> or C<< my $ref = \&CORE::chdir;
$ref->($dir) >> would throw an error saying C<&CORE::chdir cannot be called
directly>. These cases are now fully supported.

=head1 Performance Enhancements

=over 4

=item *

Constant-folded strings are now sharable via the Copy-on-Write mechanism.
[L<GH #22163|https://github.com/Perl/perl5/pull/22163>]

The following code would previously have allocated eleven string buffers,
each containing one million "A"s:

C<my @scalars; push @scalars, ("A" x 1_000_000) for 0..9;>

Now a single buffer is allocated and shared between a CONST OP and
the ten scalar elements of L<@scalars>.

Note that any code using this sort of constant to simulate memory leaks
(perhaps in test files) must now permute the string in order to trigger
a string copy and the allocation of separate buffers. For example,
C<("A" x 1_000_000).time> might be a suitable small change.

=item *

C<Perl_leave_adjust_stacks>: additional efficiency for mortal copies.

=back

=head1 Modules and Pragmata

=head2 Updated Modules and Pragmata

=over 4

=item *

L<builtin> has been upgraded from version 0.014 to 0.015.

Documented when each L<builtin> function was first available and stabilized.

=item *

L<Data::Dumper> has been upgraded from version 2.189 to 2.190.

=item *

L<ExtUtils::ParseXS> has been upgraded from version 3.51 to 3.52.

=item *

L<Fcntl> has been upgraded from version 1.18 to 1.19.

Removed pointless C<S_ISENFMT> function.

=item *

L<Getopt::Long> has been upgraded from version 2.57 to 2.58.

=item *

L<Math::BigInt> has been upgraded from version 2.003002 to 2.003003.

=item *

L<Module::CoreList> has been upgraded from version 5.20240610 to 5.20240620.

=item *

L<POSIX> has been upgraded from version 2.20 to 2.21.

=item *

L<sort> has been upgraded from version 2.05 to 2.06.

=item *

L<Test2::Suite> has been upgraded from version 0.000162 to 0.000163.

=item *

L<VMS::Filespec> has been upgraded from version 1.13 to 1.14.

=item *

L<warnings> has been upgraded from version 1.69 to 1.70.

=back

=head1 Documentation

=head2 Changes to Existing Documentation

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>.

Additionally, the following selected changes have been made:

=head3 L<perlapi>

=over 4

=item *

Combined the documentation for several groups of related functions
into single entries.

=back

=head3 L<perlfunc>

=over 4

=item *

Clarified the description of C<ref> and C<reftype> in relation
to built-in types and class names.

=item *

Clarified that perl C<sort> is stable (and has been since v5.8.0).

=back

=head3 L<perlguts>

=over 4

=item *

Added some description of "real" C<AV>s compared to "fake" C<AV>s.

=back

=head1 Testing

Tests were added and changed to reflect the other additions and
changes in this release.  Furthermore, these significant changes were
made:

=over 4

=item *

A new F<t/run/todo.t> test script was added as a place for TODO tests
for known unfixed bugs.

=back

=head1 Internal Changes

=over 4

=item *

The L<perlapi/C<sv_strftime_ints>> function is introduced.  This is an
enhanced version of L<perlapi/C<my_strftime>>, which is retained for
backwards compatibility.  Both are to call L<strftime(3)> when you have
the year, month, hour, etc.  The new function handles UTF8ness for you,
and allows you to specify if you want the possibility of daylight
savings time to be considered.  C<my_strftime> never considers DST.

=item *

The C<bytes_to_utf8>, C<bytes_from_utf8>, and C<bytes_from_utf8_loc>
functions are no longer experimental.

=back

=head1 Selected Bug Fixes

=over 4

=item *

Fix null pointer dereference in S_SvREFCNT_dec [L<GH #16627|https://github.com/Perl/perl5/issues/16627>].

=item *

Fix feature 'class' Segmentation fault in DESTROY [L<GH #22278|https://github.com/Perl/perl5/issues/22278>].

=item *

Fix C<POSIX::strftime()> [L<GH #22369|https://github.com/Perl/perl5/issues/22369>].

=back

=head1 Acknowledgements

Perl 5.41.1 represents approximately 3 weeks of development since Perl
5.41.0 and contains approximately 6,000 lines of changes across 270 files
from 20 authors.

Excluding auto-generated files, documentation and release tools, there were
approximately 3,900 lines of changes to 210 .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 5.41.1:

Chad Granum, Craig A. Berry, Dabrien 'Dabe' Murphy, Dan Book, David
Mitchell, Elvin Aslanov, Graham Knop, James E Keenan, James Raspass, Johan
Vromans, Karl Williamson, Leon Timmermans, Lukas Mai, Max Maischein, Paul
Evans, Peter John Acklam, Philippe Bruhat (BooK), Richard Leach, TAKAI
Kousuke, 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 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