This document describes differences between the 5.12.2 release and the
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.
There are no changes intentionally incompatible with 5.12.2. If any
exist, they are bugs and reports are welcome.
"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.
"no VERSION" will now correctly deparse with B::Deparse, as will
certain constant expressions.
Module::Build 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
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:
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
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
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 email@example.com 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 firstname.lastname@example.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.
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 v5.22.1 2018-11-19 PERL5123DELTA(1)
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