# phpman > man > perl5123delta(1)


*Source: tldr-pages*

---

[PERL5123DELTA(1)](https://www.chedong.com/phpMan.php/man/PERL5123DELTA/1/markdown)                  Perl Programmers Reference Guide                  [PERL5123DELTA(1)](https://www.chedong.com/phpMan.php/man/PERL5123DELTA/1/markdown)



## NAME
       perl5123delta - what is new for perl v5.12.3

## DESCRIPTION
       This document describes differences between the 5.12.2 release and the 5.12.3 release.

       If you are upgrading from an earlier release such as 5.12.1, first read perl5122delta, which
       describes differences between 5.12.1 and 5.12.2.  The major changes made in 5.12.0 are
       described in perl5120delta.

### Incompatible Changes
           There are no changes intentionally incompatible with 5.12.2. If any
           exist, they are bugs and reports are welcome.

### Core Enhancements
### "keys", "values" work on arrays
       You can now use the "keys", "values", "each" builtin functions on arrays (previously you
       could only use them on hashes).  See perlfunc for details.  This is actually a change
       introduced in perl 5.12.0, but it was missed from that release's perldelta.

### Bug Fixes
       "no VERSION" will now correctly deparse with [B::Deparse](https://www.chedong.com/phpMan.php/perldoc/B%3A%3ADeparse/markdown), as will certain constant
       expressions.

       [Module::Build](https://www.chedong.com/phpMan.php/perldoc/Module%3A%3ABuild/markdown) should be more reliably pass its tests under cygwin.

       Lvalue subroutines are again able to return copy-on-write scalars.  This had been broken
       since version 5.10.0.

### Platform Specific Notes
       Solaris
           A separate DTrace is now build for miniperl, which means that perl can be compiled with
           -Dusedtrace on Solaris again.

       VMS A number of regressions on VMS have been fixed.  In addition to minor cleanup of
           questionable expressions in _vms.c_, file permissions should no longer be garbled by the
           PerlIO layer, and spurious record boundaries should no longer be introduced by the PerlIO
           layer during output.

           For more details and discussion on the latter, see:

               <http://www.nntp.perl.org/group/perl.vmsperl/2010/11/msg15419.html>

       VOS A few very small changes were made to the build process on VOS to better support the
           platform.  Longer-than-32-character filenames are now supported on OpenVOS, and build
           properly without IPv6 support.

## Acknowledgements
       Perl 5.12.3 represents approximately four months of development since Perl 5.12.2 and
       contains approximately 2500 lines of changes across 54 files from 16 authors.

       Perl continues to flourish into its third decade thanks to a vibrant community of users and
       developers.  The following people are known to have contributed the improvements that became
       Perl 5.12.3:

       Craig A. Berry, David Golden, David Leadbeater, Father Chrysostomos, Florian Ragwitz, Jesse
       Vincent, Karl Williamson, Nick Johnston, Nicolas Kaiser, Paul Green, Rafael Garcia-Suarez,
       Rainer Tammer, Ricardo Signes, Steffen Mueller, Zsbán Ambrus, Ævar Arnfjörð Bjarmason

### Reporting Bugs
       If you find what you think is a bug, you might check the articles recently posted to the
       comp.lang.perl.misc newsgroup and the perl bug database at <http://rt.perl.org/perlbug/> .
       There may also be information at <http://www.perl.org/> , the Perl Home Page.

       If you believe you have an unreported bug, please run the **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 "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 please send it to <perl5-security-report@perl.org>.
       This points to a closed subscription unarchived mailing list, which includes all the core
       committers, who will be able to help assess the impact of issues, figure out a resolution,
       and help co-ordinate the release of patches to mitigate or fix the problem across all
       platforms on which Perl is supported. Please only use this address for security issues in the
       Perl core, not for modules independently distributed on CPAN.

## SEE ALSO
       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.



perl v5.34.0                                 2025-07-25                             [PERL5123DELTA(1)](https://www.chedong.com/phpMan.php/man/PERL5123DELTA/1/markdown)