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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+. ds C` ""
+. ds C' ""
+'br\}
+.el\{\
+. ds C`
+. ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+. if \nF \{\
+. de IX
+. tm Index:\\$1\t\\n%\t"\\$2"
+..
+. if !\nF==2 \{\
+. nr % 0
+. nr F 2
+. \}
+. \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "PERL5201DELTA 1"
+.TH PERL5201DELTA 1 2024-01-25 "perl v5.38.2" "Perl Programmers Reference Guide"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+perl5201delta \- what is new for perl v5.20.1
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+This document describes differences between the 5.20.0 release and the 5.20.1
+release.
+.PP
+If you are upgrading from an earlier release such as 5.18.0, first read
+perl5200delta, which describes differences between 5.18.0 and 5.20.0.
+.SH "Incompatible Changes"
+.IX Header "Incompatible Changes"
+There are no changes intentionally incompatible with 5.20.0. If any exist,
+they are bugs, and we request that you submit a report. See "Reporting Bugs"
+below.
+.SH "Performance Enhancements"
+.IX Header "Performance Enhancements"
+.IP \(bu 4
+An optimization to avoid problems with COW and deliberately overallocated PVs
+has been disabled because it interfered with another, more important,
+optimization, causing a slowdown on some platforms.
+[GH #13878] <https://github.com/Perl/perl5/issues/13878>
+.IP \(bu 4
+Returning a string from a lexical variable could be slow in some cases. This
+has now been fixed.
+[GH #13880] <https://github.com/Perl/perl5/issues/13880>
+.SH "Modules and Pragmata"
+.IX Header "Modules and Pragmata"
+.SS "Updated Modules and Pragmata"
+.IX Subsection "Updated Modules and Pragmata"
+.IP \(bu 4
+Config::Perl::V has been upgraded from version 0.20 to 0.22.
+.Sp
+The list of Perl versions covered has been updated and some flaws in the
+parsing have been fixed.
+.IP \(bu 4
+Exporter has been upgraded from version 5.70 to 5.71.
+.Sp
+Illegal POD syntax in the documentation has been corrected.
+.IP \(bu 4
+ExtUtils::CBuilder has been upgraded from version 0.280216 to 0.280217.
+.Sp
+Android builds now link to both \fB\-lperl\fR and \f(CW$Config::Config{perllibs}\fR.
+.IP \(bu 4
+File::Copy has been upgraded from version 2.29 to 2.30.
+.Sp
+The documentation now notes that \f(CW\*(C`copy\*(C'\fR will not overwrite read-only files.
+.IP \(bu 4
+Module::CoreList has been upgraded from version 3.11 to 5.020001.
+.Sp
+The list of Perl versions covered has been updated.
+.IP \(bu 4
+The PathTools module collection has been upgraded from version 3.47 to 3.48.
+.Sp
+Fallbacks are now in place when cross-compiling for Android and
+\&\f(CW$Config::Config{sh}\fR is not yet defined.
+[GH #13872] <https://github.com/Perl/perl5/issues/13872>
+.IP \(bu 4
+PerlIO::via has been upgraded from version 0.14 to 0.15.
+.Sp
+A minor portability improvement has been made to the XS implementation.
+.IP \(bu 4
+Unicode::UCD has been upgraded from version 0.57 to 0.58.
+.Sp
+The documentation includes many clarifications and fixes.
+.IP \(bu 4
+utf8 has been upgraded from version 1.13 to 1.13_01.
+.Sp
+The documentation has some minor formatting improvements.
+.IP \(bu 4
+version has been upgraded from version 0.9908 to 0.9909.
+.Sp
+External libraries and Perl may have different ideas of what the locale is.
+This is problematic when parsing version strings if the locale's numeric
+separator has been changed. Version parsing has been patched to ensure it
+handles the locales correctly.
+[GH #13863] <https://github.com/Perl/perl5/issues/13863>
+.SH Documentation
+.IX Header "Documentation"
+.SS "Changes to Existing Documentation"
+.IX Subsection "Changes to Existing Documentation"
+\fIperlapi\fR
+.IX Subsection "perlapi"
+.IP \(bu 4
+\&\f(CW\*(C`av_len\*(C'\fR \- Emphasize that this returns the highest index in the array, not the
+size of the array.
+[GH #13377] <https://github.com/Perl/perl5/issues/13377>
+.IP \(bu 4
+Note that \f(CW\*(C`SvSetSV\*(C'\fR doesn't do set magic.
+.IP \(bu 4
+\&\f(CW\*(C`sv_usepvn_flags\*(C'\fR \- Fix documentation to mention the use of \f(CW\*(C`NewX\*(C'\fR instead of
+\&\f(CW\*(C`malloc\*(C'\fR.
+[GH #13835] <https://github.com/Perl/perl5/issues/13835>
+.IP \(bu 4
+Clarify where \f(CW\*(C`NUL\*(C'\fR may be embedded or is required to terminate a string.
+.PP
+\fIperlfunc\fR
+.IX Subsection "perlfunc"
+.IP \(bu 4
+Clarify the meaning of \f(CW\*(C`\-B\*(C'\fR and \f(CW\*(C`\-T\*(C'\fR.
+.IP \(bu 4
+\&\f(CW\*(C`\-l\*(C'\fR now notes that it will return false if symlinks aren't supported by the
+file system.
+[GH #13695] <https://github.com/Perl/perl5/issues/13695>
+.IP \(bu 4
+Note that \f(CW\*(C`each\*(C'\fR, \f(CW\*(C`keys\*(C'\fR and \f(CW\*(C`values\*(C'\fR may produce different orderings for
+tied hashes compared to other perl hashes.
+[GH #13650] <https://github.com/Perl/perl5/issues/13650>
+.IP \(bu 4
+Note that \f(CW\*(C`exec LIST\*(C'\fR and \f(CW\*(C`system LIST\*(C'\fR may fall back to the shell on Win32.
+Only \f(CW\*(C`exec PROGRAM LIST\*(C'\fR and \f(CW\*(C`system PROGRAM LIST\*(C'\fR indirect object syntax
+will reliably avoid using the shell. This has also been noted in perlport.
+[GH #13907] <https://github.com/Perl/perl5/issues/13907>
+.IP \(bu 4
+Clarify the meaning of \f(CW\*(C`our\*(C'\fR.
+[GH #13938] <https://github.com/Perl/perl5/issues/13938>
+.PP
+\fIperlguts\fR
+.IX Subsection "perlguts"
+.IP \(bu 4
+Explain various ways of modifying an existing SV's buffer.
+[GH #12813] <https://github.com/Perl/perl5/issues/12813>
+.PP
+\fIperlpolicy\fR
+.IX Subsection "perlpolicy"
+.IP \(bu 4
+We now have a code of conduct for the \fIp5p\fR mailing list, as documented in
+"STANDARDS OF CONDUCT" in perlpolicy.
+.PP
+\fIperlre\fR
+.IX Subsection "perlre"
+.IP \(bu 4
+The \f(CW\*(C`/x\*(C'\fR modifier has been clarified to note that comments cannot be continued
+onto the next line by escaping them.
+.PP
+\fIperlsyn\fR
+.IX Subsection "perlsyn"
+.IP \(bu 4
+Mention the use of empty conditionals in \f(CW\*(C`for\*(C'\fR/\f(CW\*(C`while\*(C'\fR loops for infinite
+loops.
+.PP
+\fIperlxs\fR
+.IX Subsection "perlxs"
+.IP \(bu 4
+Added a discussion of locale issues in XS code.
+.SH Diagnostics
+.IX Header "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 perldiag.
+.SS "Changes to Existing Diagnostics"
+.IX Subsection "Changes to Existing Diagnostics"
+.IP \(bu 4
+Variable length lookbehind not implemented in regex m/%s/
+.Sp
+Information about Unicode behaviour has been added.
+.SH "Configuration and Compilation"
+.IX Header "Configuration and Compilation"
+.IP \(bu 4
+Building Perl no longer writes to the source tree when configured with
+\&\fIConfigure\fR's \fB\-Dmksymlinks\fR option.
+[GH #13712] <https://github.com/Perl/perl5/issues/13712>
+.SH "Platform Support"
+.IX Header "Platform Support"
+.SS "Platform-Specific Notes"
+.IX Subsection "Platform-Specific Notes"
+.IP Android 4
+.IX Item "Android"
+Build support has been improved for cross-compiling in general and for Android
+in particular.
+.IP OpenBSD 4
+.IX Item "OpenBSD"
+Corrected architectures and version numbers used in configuration hints when
+building Perl.
+.IP Solaris 4
+.IX Item "Solaris"
+\&\fBc99\fR options have been cleaned up, hints look for \fBsolstudio\fR as well as
+\&\fBSUNWspro\fR, and support for native \f(CW\*(C`setenv\*(C'\fR has been added.
+.IP VMS 4
+.IX Item "VMS"
+An old bug in feature checking, mainly affecting pre\-7.3 systems, has been
+fixed.
+.IP Windows 4
+.IX Item "Windows"
+\&\f(CW%I64d\fR is now being used instead of \f(CW%lld\fR for MinGW.
+.SH "Internal Changes"
+.IX Header "Internal Changes"
+.IP \(bu 4
+Added "sync_locale" in perlapi.
+Changing the program's locale should be avoided by XS code. Nevertheless,
+certain non-Perl libraries called from XS, such as \f(CW\*(C`Gtk\*(C'\fR do so. When this
+happens, Perl needs to be told that the locale has changed. Use this function
+to do so, before returning to Perl.
+.SH "Selected Bug Fixes"
+.IX Header "Selected Bug Fixes"
+.IP \(bu 4
+A bug has been fixed where zero-length assertions and code blocks inside of a
+regex could cause \f(CW\*(C`pos\*(C'\fR to see an incorrect value.
+[GH #14016] <https://github.com/Perl/perl5/issues/14016>
+.IP \(bu 4
+Using \f(CW\*(C`s///e\*(C'\fR on tainted utf8 strings could issue bogus "Malformed UTF\-8
+character (unexpected end of string)" warnings. This has now been fixed.
+[GH #13948] <https://github.com/Perl/perl5/issues/13948>
+.IP \(bu 4
+\&\f(CW\*(C`system\*(C'\fR and friends should now work properly on more Android builds.
+.Sp
+Due to an oversight, the value specified through \fB\-Dtargetsh\fR to \fIConfigure\fR
+would end up being ignored by some of the build process. This caused perls
+cross-compiled for Android to end up with defective versions of \f(CW\*(C`system\*(C'\fR,
+\&\f(CW\*(C`exec\*(C'\fR and backticks: the commands would end up looking for \fI/bin/sh\fR instead
+of \fI/system/bin/sh\fR, and so would fail for the vast majority of devices,
+leaving \f(CW$!\fR as \f(CW\*(C`ENOENT\*(C'\fR.
+.IP \(bu 4
+Many issues have been detected by Coverity <http://www.coverity.com/> and
+fixed.
+.SH Acknowledgements
+.IX Header "Acknowledgements"
+Perl 5.20.1 represents approximately 4 months of development since Perl 5.20.0
+and contains approximately 12,000 lines of changes across 170 files from 36
+authors.
+.PP
+Excluding auto-generated files, documentation and release tools, there were
+approximately 2,600 lines of changes to 110 .pm, .t, .c and .h files.
+.PP
+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 5.20.1:
+.PP
+Aaron Crane, Abigail, Alberto Simões, Alexandr Ciornii, Alexandre (Midnite)
+Jousset, Andrew Fresh, Andy Dougherty, Brian Fraser, Chris 'BinGOs' Williams,
+Craig A. Berry, Daniel Dragan, David Golden, David Mitchell, H.Merijn Brand,
+James E Keenan, Jan Dubois, Jarkko Hietaniemi, John Peacock, kafka, Karen
+Etheridge, Karl Williamson, Lukas Mai, Matthew Horsfall, Michael Bunk, Peter
+Martini, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes, Shirakata Kentaro,
+Smylers, Steve Hay, Thomas Sibley, Todd Rinaldo, Tony Cook, Vladimir Marek,
+Yves Orton.
+.PP
+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.
+.PP
+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.
+.PP
+For a more complete list of all of Perl's historical contributors, please see
+the \fIAUTHORS\fR file in the Perl source distribution.
+.SH "Reporting Bugs"
+.IX Header "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
+https://rt.perl.org/ . There may also be information at http://www.perl.org/ ,
+the Perl Home Page.
+.PP
+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 \f(CW\*(C`perl \-V\*(C'\fR,
+will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
+.PP
+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.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+The \fIChanges\fR file for an explanation of how to view exhaustive details on
+what changed.
+.PP
+The \fIINSTALL\fR file for how to build Perl.
+.PP
+The \fIREADME\fR file for general stuff.
+.PP
+The \fIArtistic\fR and \fICopying\fR files for copyright information.