{
    "mode": "man",
    "parameter": "PERL5124DELTA",
    "section": "1",
    "url": "https://www.chedong.com/phpMan.php/man/PERL5124DELTA/1/json",
    "generated": "2026-06-07T06:23:37Z",
    "sections": {
        "NAME": {
            "content": "perl5124delta - what is new for perl v5.12.4\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "This document describes differences between the 5.12.3 release and the 5.12.4 release.\n\nIf you are upgrading from an earlier release such as 5.12.2, first read perl5123delta, which\ndescribes differences between 5.12.2 and 5.12.3. The major changes made in 5.12.0 are\ndescribed in perl5120delta.\n",
            "subsections": [
                {
                    "name": "Incompatible Changes",
                    "content": "There are no changes intentionally incompatible with 5.12.3. If any exist, they are bugs and\nreports are welcome.\n"
                },
                {
                    "name": "Selected Bug Fixes",
                    "content": "When strict \"refs\" mode is off, \"%{...}\" in rvalue context returns \"undef\" if its argument is\nundefined.  An optimisation introduced in Perl 5.12.0 to make \"keys %{...}\" faster when used\nas a boolean did not take this into account, causing \"keys %{+undef}\" (and \"keys %$foo\" when\n$foo is undefined) to be an error, which it should be so in strict mode only [perl #81750].\n\n\"lc\", \"uc\", \"lcfirst\", and \"ucfirst\" no longer return untainted strings when the argument is\ntainted. This has been broken since perl 5.8.9 [perl #87336].\n\nFixed a case where it was possible that a freed buffer may have been read from when parsing a\nhere document.\n"
                },
                {
                    "name": "Modules and Pragmata",
                    "content": "Module::CoreList has been upgraded from version 2.43 to 2.50.\n"
                }
            ]
        },
        "Testing": {
            "content": "The cpan/CGI/t/http.t test script has been fixed to work when the environment has HTTPS*\nenvironment variables, such as HTTPSPROXY.\n",
            "subsections": []
        },
        "Documentation": {
            "content": "Updated the documentation for rand() in perlfunc to note that it is not cryptographically\nsecure.\n",
            "subsections": [
                {
                    "name": "Platform Specific Notes",
                    "content": "Linux\nSupport Ubuntu 11.04's new multi-arch library layout.\n"
                }
            ]
        },
        "Acknowledgements": {
            "content": "Perl 5.12.4 represents approximately 5 months of development since Perl 5.12.3 and contains\napproximately 200 lines of changes across 11 files from 8 authors.\n\nPerl continues to flourish into its third decade thanks to a vibrant community of users and\ndevelopers.  The following people are known to have contributed the improvements that became\nPerl 5.12.4:\n\nAndy Dougherty, David Golden, David Leadbeater, Father Chrysostomos, Florian Ragwitz, Jesse\nVincent, Leon Brocard, Zsbán Ambrus.\n",
            "subsections": [
                {
                    "name": "Reporting Bugs",
                    "content": "If you find what you think is a bug, you might check the articles recently posted to the\ncomp.lang.perl.misc newsgroup and the perl bug database at http://rt.perl.org/perlbug/ .\nThere may also be information at http://www.perl.org/ , the Perl Home Page.\n\nIf you believe you have an unreported bug, please run the perlbug program included with your\nrelease.  Be sure to trim your bug down to a tiny but sufficient test case.  Your bug report,\nalong with the output of \"perl -V\", will be sent off to perlbug@perl.org to be analysed by\nthe Perl porting team.\n\nIf the bug you are reporting has security implications, which make it inappropriate to send\nto a publicly archived mailing list, then please send it to perl5-security-report@perl.org.\nThis points to a closed subscription unarchived mailing list, which includes all the core\ncommitters, who be able to help assess the impact of issues, figure out a resolution, and\nhelp co-ordinate the release of patches to mitigate or fix the problem across all platforms\non which Perl is supported. Please only use this address for security issues in the Perl\ncore, not for modules independently distributed on CPAN.\n"
                }
            ]
        },
        "SEE ALSO": {
            "content": "The Changes file for an explanation of how to view exhaustive details on what changed.\n\nThe INSTALL file for how to build Perl.\n\nThe README file for general stuff.\n\nThe Artistic and Copying files for copyright information.\n\n\n\nperl v5.34.0                                 2025-07-25                             PERL5124DELTA(1)",
            "subsections": []
        }
    },
    "summary": "perl5124delta - what is new for perl v5.12.4",
    "flags": [],
    "examples": [],
    "see_also": []
}