=encoding utf8

=head1 NAME

perl5414delta - what is new for perl v5.41.4

=head1 DESCRIPTION

This document describes differences between the 5.41.3 release and the 5.41.4
release.

If you are upgrading from an earlier release such as 5.41.2, first read
L<perl5413delta>, which describes differences between 5.41.2 and 5.41.3.

=head1 Modules and Pragmata

=head2 Updated Modules and Pragmata

=over 4

=item *

L<CPAN> has been upgraded from version 2.36 to 2.37.

=item *

L<Devel::Peek> has been upgraded from version 1.34 to 1.36.

=item *

L<ExtUtils::ParseXS> has been upgraded from version 3.53 to 3.54.

=item *

L<ExtUtils::Typemaps> has been upgraded from version 3.53 to 3.54.

=item *

L<Module::CoreList> has been upgraded from version 5.20240829 to 5.20240920.

=item *

L<overload> has been upgraded from version 1.38 to 1.39.

=item *

L<Scalar::Util> has been upgraded from version 1.65 to 1.66.

=item *

L<Storable> has been upgraded from version 3.34 to 3.35.

=item *

L<Test::Simple> has been upgraded from version 1.302201 to 1.302204.

=item *

L<version> has been upgraded from version 0.9930 to 0.9933.

=item *

L<XS::APItest> has been upgraded from version 1.37 to 1.38.

=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>.

=head3 New Warnings

=over 4

=item *

L<Possible precedence problem between ! and %s|perldiag/"Possible precedence problem between ! and %s">

(W precedence) You wrote something like

    !$x < $y               # parsed as: (!$x) < $y
    !$x eq $y              # parsed as: (!$x) eq $y
    !$x =~ /regex/         # parsed as: (!$x) =~ /regex/
    !$obj isa Some::Class  # parsed as: (!$obj) isa Some::Class

but because C<!> has higher precedence than comparison operators, C<=~>, and
C<isa>, this is interpreted as comparing/matching the logical negation of the
first operand, instead of negating the result of the comparison/match.

To disambiguate, either use a negated comparison/binding operator:

    $x >= $y
    $x ne $y
    $x !~ /regex/

... or parentheses:

    !($x < $y)
    !($x eq $y)
    !($x =~ /regex/)
    !($obj isa Some::Class)

... or the low-precedence C<not> operator:

    not $x < $y
    not $x eq $y
    not $x =~ /regex/
    not $obj isa Some::Class

(If you did mean to compare the boolean result of negating the first operand,
parenthesize as C<< (!$x) < $y >>, C<< (!$x) eq $y >>, etc.)

(This warning subsumes the C<Possible precedence problem on isa operator>
warning from the previous perl release.)

=back

=head1 Configuration and Compilation

=over 4

=item *

Fix compilation on platforms (e.g. "Gentoo Prefix") with only a C locale [L<GH #22569|https://github.com/Perl/perl5/issues/22569>]
Bug first reported downstream L<bugs.gentoo.org/939014|https://bugs.gentoo.org/939014> 

=back

=head1 Internal Changes

=over 4

=item *

The C<op_dump()> function has been expanded to include additional information
about the recent C<OP_METHSTART> and C<OP_INITFIELD> ops, as well as for
C<OP_ARGCHECK> and C<OP_ARGELEM> which had not been done previously.

=item *

C<op_dump()> now also has the facility to print extra debugging information
about custom operators, if those operators register a helper function via the
new C<xop_dump> element of the C<XOP> structure. For more information, see the
relevant additions to L<perlguts|perlguts/"Custom Operators">.

=back

=head1 Selected Bug Fixes

=over 4

=item *

C<pack("p", ...)> and C<pack("P", ...)> now SvPV_force() the supplied
SV unless it is read only.  This will remove CoW from the SV and
prevents code that writes through the generated pointer from modifying
the value of other SVs that happen the share the same CoWed string
buffer.

Note: this does not make C<pack("p",... )> safe, if the SV is magical
then any writes to the buffer will likely be discarded on the next
read.  [L<GH #22380|https://github.com/Perl/perl5/issues/22380>]

=item *

Enforce C<no feature "bareword_filehandles"> for bareword file handles
that have strictness removed because they are used in open() with a
"dup" mode, such as in C<< open my $fh, ">&", THISHANDLE >>. [L<GH #22568|https://github.com/Perl/perl5/issues/22568>]

=item *

Using C<goto> to tail call, or using the call_sv() and related APIs to
call, any of trim(), refaddr(), reftype(), ceil(), floor() or
stringify() in the C<builtin::> package would crash or assert due to a
C<TARG> handling bug. [L<GH #22542|https://github.com/Perl/perl5/issues/22542>]

=item *

Fix sv_gets() to accept a C<SSize_t> append offset instead of C<I32>.
This prevents integer overflows when appending to a large C<SV> for
C<readpipe> aka C<qx//> and C<readline>.
L<https://www.perlmonks.org/?node_id=11161665>

=item *

Fixed an issue where `utf8n_to_uvchr` failed to correctly identify
certain invalid UTF-8 sequences as invalid. Specifically, sequences
that start with continuation bytes or unassigned bytes could cause
unexpected behavior or a panic. This fix ensures that such invalid
sequences are now properly detected and handled. This correction
also resolves related issues in modules that handle UTF-8 processing,
such as `Encode.pm`.

=back

=head1 Acknowledgements

Perl 5.41.4 represents approximately 3 weeks of development since Perl
5.41.3 and contains approximately 5,800 lines of changes across 400 files
from 20 authors.

Excluding auto-generated files, documentation and release tools, there were
approximately 3,700 lines of changes to 290 .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 5.41.4:

Andrei Horodniceanu, Antanas Vaitkus, Aristotle Pagaltzis, Craig A. Berry,
David Cantrell, David Mitchell, E. Choroba, Ed J, Eric Herman, Graham Knop,
James E Keenan, Karl Williamson, Leon Timmermans, Lukas Mai, Masahiro Honma,
Paul Evans, Philippe Bruhat (BooK), Sisyphus, Thibault Duponchelle, 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