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perl5338delta - what is new for perl v5.33.8


This document describes differences between the 5.33.7 release and the 5.33.8 release.

If you are upgrading from an earlier release such as 5.33.6, first read perl5337delta, which describes differences between 5.33.6 and 5.33.7.

Performance Enhancements

Modules and Pragmata

Updated Modules and Pragmata

  • Compress::Raw::Bzip2 has been upgraded from version 2.100 to 2.101.

  • Compress::Raw::Zlib has been upgraded from version 2.100 to 2.101.

  • Data::Dumper has been upgraded from version 2.176 to 2.177.

  • IO::Compress has been upgraded from version 2.100 to 2.102.

    - bin/zipdetails version 2.02

  • Module::CoreList has been upgraded from version 5.20210220 to 5.20210320.

  • Pod::Html has been upgraded from version 1.26 to 1.27.

  • Win32 has been upgraded from version 0.54 to 0.57.

    - fix calling convention for PFNRegGetValueA - added Win32::IsSymlinkCreationAllowed(), Win32::IsDeveloperModeEnabled(), and Win32::GetProcessPrivileges() - removed old code for versions before Windows 2000


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 https://github.com/Perl/perl5/issues.

Additionally, the following selected changes have been made:

perlfunc and perlsyn

  • Document that caller() does not see try{} blocks


  • document how to create a remote-tracking branch for every PR

  • document how to get a PR as a local branch


  • Fix description of what Perl does with unencoded strings


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

  • Split Config-dependent tests in t/opbasic/arith.t to t/op/arith2.t

Internal Changes

  • A set of cop_hints_exists_{pv,pvn,pvs,sv} functions was added, to support checking for the existence of keys in the hints hash of a specific cop without needing to create a mortal copy of said value.

  • An aid has been added for using the DEBUG macros when debugging XS or C code. The comments in perl.h describe DEBUG_PRE_STMTS and DEBUG_POST_STMTS. which you can #define to do things like save and restore errno, in case the DEBUG calls are interfering with that, or to display timestamps, or which thread it's coming from, or the location of the call, or whatever. You can make a quick hack to help you track something down without having to edit individual DEBUG calls.

  • Make REFCOUNTED_HE_EXISTS available outside of core

Selected Bug Fixes


Perl 5.33.8 represents approximately 4 weeks of development since Perl 5.33.7 and contains approximately 3,300 lines of changes across 120 files from 15 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 1,100 lines of changes to 66 .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 5.33.8:

Aaron Crane, brian d foy, Craig A. Berry, David Mitchell, Felipe Gasper, James E Keenan, Karl Williamson, Keith Thompson, Leon Timmermans, Nicolas R., Paul Evans, Renee Baecker, Ricardo Signes, Tomasz Konojacki, 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 AUTHORS file in the Perl source distribution.

Reporting Bugs

If you find what you think is a bug, you might check the perl bug database at https://github.com/Perl/perl5/issues. There may also be information at http://www.perl.org/, the Perl Home Page.

If you believe you have an unreported bug, please open an issue at 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 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue.

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 perlthanks program:


This will send an email to the Perl 5 Porters list with your show of thanks.


The Changes file for an explanation of how to view exhaustive details on what changed.

The INSTALL file for how to build Perl.

The README file for general stuff.

The Artistic and Copying files for copyright information.