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+=head1 NAME
+
+perl586delta - what is new for perl v5.8.6
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.8.5 release and
+the 5.8.6 release.
+
+=head1 Incompatible Changes
+
+There are no changes incompatible with 5.8.5.
+
+=head1 Core Enhancements
+
+The perl interpreter is now more tolerant of UTF-16-encoded scripts.
+
+On Win32, Perl can now use non-IFS compatible LSPs, which allows Perl to
+work in conjunction with firewalls such as McAfee Guardian. For full details
+see the file F<README.win32>, particularly if you're running Win95.
+
+=head1 Modules and Pragmata
+
+=over 4
+
+=item *
+
+With the C<base> pragma, an intermediate class with no fields used to messes
+up private fields in the base class. This has been fixed.
+
+=item *
+
+Cwd upgraded to version 3.01 (as part of the new PathTools distribution)
+
+=item *
+
+Devel::PPPort upgraded to version 3.03
+
+=item *
+
+File::Spec upgraded to version 3.01 (as part of the new PathTools distribution)
+
+=item *
+
+Encode upgraded to version 2.08
+
+=item *
+
+ExtUtils::MakeMaker remains at version 6.17, as later stable releases currently
+available on CPAN have some issues with core modules on some core platforms.
+
+=item *
+
+I18N::LangTags upgraded to version 0.35
+
+=item *
+
+Math::BigInt upgraded to version 1.73
+
+=item *
+
+Math::BigRat upgraded to version 0.13
+
+=item *
+
+MIME::Base64 upgraded to version 3.05
+
+=item *
+
+POSIX::sigprocmask function can now retrieve the current signal mask without
+also setting it.
+
+=item *
+
+Time::HiRes upgraded to version 1.65
+
+=back
+
+=head1 Utility Changes
+
+Perl has a new -dt command-line flag, which enables threads support in the
+debugger.
+
+=head1 Performance Enhancements
+
+C<reverse sort ...> is now optimized to sort in reverse, avoiding the
+generation of a temporary intermediate list.
+
+C<for (reverse @foo)> now iterates in reverse, avoiding the generation of a
+temporary reversed list.
+
+=head1 Selected Bug Fixes
+
+The regexp engine is now more robust when given invalid utf8 input, as is
+sometimes generated by buggy XS modules.
+
+C<foreach> on threads::shared array used to be able to crash Perl. This bug
+has now been fixed.
+
+A regexp in C<STDOUT>'s destructor used to coredump, because the regexp pad
+was already freed. This has been fixed.
+
+C<goto &> is now more robust - bugs in deep recursion and chained C<goto &>
+have been fixed.
+
+Using C<delete> on an array no longer leaks memory. A C<pop> of an item from a
+shared array reference no longer causes a leak.
+
+C<eval_sv()> failing a taint test could corrupt the stack - this has been
+fixed.
+
+On platforms with 64 bit pointers numeric comparison operators used to
+erroneously compare the addresses of references that are overloaded, rather
+than using the overloaded values. This has been fixed.
+
+C<read> into a UTF8-encoded buffer with an offset off the end of the buffer
+no longer mis-calculates buffer lengths.
+
+Although Perl has promised since version 5.8 that C<sort()> would be
+stable, the two cases C<sort {$b cmp $a}> and C<< sort {$b <=> $a} >> could
+produce non-stable sorts.   This is corrected in perl5.8.6.
+
+Localising C<$^D> no longer generates a diagnostic message about valid -D
+flags.
+
+=head1 New or Changed Diagnostics
+
+For -t and -T,
+   Too late for "-T" option
+has been changed to the more informative
+   "-T" is on the #! line, it must also be used on the command line
+
+=head1 Changed Internals
+
+From now on all applications embedding perl will behave as if perl
+were compiled with -DPERL_USE_SAFE_PUTENV.  See "Environment access" in
+the F<INSTALL> file for details.
+
+Most C<C> source files now have comments at the top explaining their purpose,
+which should help anyone wishing to get an overview of the implementation.
+
+=head1 New Tests
+
+There are significantly more tests for the C<B> suite of modules.
+
+=head1 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://bugs.perl.org.  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 B<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 C<perl -V>, will be sent off to perlbug@perl.org to be
+analysed by the Perl porting team.  You can browse and search
+the Perl 5 bugs at http://bugs.perl.org/
+
+=head1 SEE ALSO
+
+The F<Changes> file for exhaustive details on what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut