Change enum names for new locale function parameters

[perl5.git] / pod / perldelta.pod

=encoding utf8

=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 v5.27.10

=head1 DESCRIPTION

This document describes differences between the 5.27.9 release and the 5.27.10
release.

If you are upgrading from an earlier release such as 5.27.8, first read
L<perl5279delta>, which describes differences between 5.27.8 and 5.27.9.

=head1 Notice

XXX Any important notices here

=head1 Core Enhancements

=head2 XXX

XXX

=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

=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.

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.)

[ Within each section, list entries as an =item entry ]

=head2 New Modules and Pragmata

=over 4

=item *

XXX Remove this section if not applicable.

=back

=head2 Updated Modules and Pragmata

=over 4

=item *

L<Carp> has been upgraded from version 1.46 to 1.4x.

XXX Please update the version number.

L<Carp>, when generating stack traces, now attempts to work around
longstanding bugs resulting from Perl's non-reference-counted stack.
[perl #52610]

Carp has been modified to avoid assuming that objects cannot be
overloaded without the L<overload> module loaded (this can happen with
objects created by XS modules).  Previously, infinite recursion would
result if an XS-defined overload method itself called Carp.  [perl #132828]

Carp now avoids using C<overload::StrVal>, partly because older versions
of L<overload> (included with perl 5.14 and earlier) load L<Scalar::Util>
at run time, which will fail if Carp has been invoked after a syntax error.

=back

=head2 Removed Modules and Pragmata

=over 4

=item *

XXX

=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>

XXX Description of the purpose of the new file here

=head2 Changes to Existing Documentation

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<XXX>

=over 4

=item *

XXX Description of the change here

=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>.

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

=back

=head2 Changes to Existing Diagnostics

XXX Changes (i.e. rewording) of diagnostic messages go here

=over 4

=item *

The new (as of 5.27.8) restriction forbidding use of C<goto> to enter the
argument of a binary or list expression (see L<perldiag/"Can't
E<quot>gotoE<quot> into a binary or list expression">) has been relaxed to
allow entering the I<first> argument of an operator that takes a fixed
number of arguments, since this is a case that will not cause stack
corruption.  [perl #132854]

=item *

The warning added in 5.27.8 concerning UTF-8 locale compatibility was
misleading.  The new wording and explanation are at
L<perldiag/Locale '%s' contains (at least) the following characters which
have unexepected meanings: %s  The Perl program will use the exepected
meanings>

=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

=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 *

F<lib/unicore/mktables> now correctly canonicalizes the names of the
dependencies stored in the files it generates.

F<regen/mk_invlists.pl>, unlike the other F<regen/*.pl> scripts, used
C<$0> to name itself in the dependencies stored in the files it
generates.  It now uses a literal so that the path stored in the
generated files doesn't depend on how F<regen/mk_invlists.pl> is
invoked.

This lack of canonical names could cause test failures in
F<t/porting/regen.t>.  [perl #132925]

=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 *

XXX

=back

=head1 Platform Support

=head2 New Platforms

=over 4

=item That Plaftorm

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 XXX-some-platform

XXX

=back

=head1 Internal Changes

=over 4

=item *

The item names passed to the function L<perlapi/Perl_langinfo>,
introduced in 5.27.4, may no longer be prefixed with C<PERL_>.  For
example, if you want the current floating point radix character, you
must call it like C<Perl_langinfo(RADIXCHAR)>.

=back

=head1 Selected Bug Fixes

=over 4

=item *

XXX

=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 *

XXX Add anything here that we forgot to add, or were mistaken about, in
the perldelta of a previous release.

=back

=head1 Obituary

XXX If any significant core contributor or member of the CPAN community has
died, add a short obituary here.

=head1 Acknowledgements

XXX Generate this with:

  perl Porting/acknowledgements.pl v5.27.9..HEAD

=head1 Reporting Bugs

If you find what you think is a bug, you might check the perl bug database
at L<https://rt.perl.org/> .  There may also be information at
L<http://www.perl.org/> , the Perl Home Page.

If you believe you have an unreported bug, please run the L<perlbug> program
included with your release.  Be sure to trim your bug down to a tiny but
sufficient test case.  Your bug report, along with the output of C<perl -V>,
will be sent off to perlbug@perl.org to be analysed by the Perl porting team.

If the bug you are reporting has security implications which make it
inappropriate to send to a publicly archived mailing list, 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