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+=encoding utf8
+
+=head1 NAME
+
+perl5132delta - what is new for perl v5.13.2
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.13.2 release and
+the 5.13.1 release.
+
+If you are upgrading from an earlier release such as 5.10, first read
+L<perl5120delta>, which describes differences between 5.10 and
+5.12.
+
+=head1 Incompatible Changes
+
+=head2 localised tied scalars are tied again.
+
+The change in behaviour in 5.13.1 of localising tied scalar values has
+been reverted to the existing 5.12.0 and earlier behaviour (the change for
+arrays and hashes remains).
+
+=head2 Naming fixes in Policy_sh.SH may invalidate Policy.sh
+
+Several long-standing typos and naming confusions in Policy_sh.SH have
+been fixed, standardizing on the variable names used in config.sh.
+
+This will change the behavior of Policy.sh if you happen to have been
+accidentally relying on the Policy.sh incorrect behavior. We'd appreciate
+feedback from anyone using Policy.sh to be sure nothing is broken by
+this change (c1bd23).
+
+=head2 Stashes are now always defined
+
+C<defined %Foo::> now always returns true, even when no symbols have yet been
+defined in that package.
+
+This is a side effect of removing a special case kludge in the tokeniser,
+added for 5.10.0, to hide side effects of changes to the internal storage of
+hashes that to drastically reduce their memory usage overhead.
+
+Calling defined on a stash has been deprecated since 5.6.0, warned on
+lexicals since 5.6.0, and has warned for stashes (and other package
+variables) since 5.12.0. C<defined %hash> has always exposed an
+implementation detail - emptying a hash by deleting all entries from it does
+not make C<defined %hash> false, hence C<defined %hash> is not valid code to
+determine whether an arbitrary hash is empty. Instead, use the behaviour
+that an empty C<%hash> always returns false in a scalar context.
+
+=head1 Core Enhancements
+
+=head2 Non-destructive substitution
+
+The substitution operator now supports a C</r> option that
+copies the input variable, carries out the substitution on
+the copy and returns the result.  The original remains unmodified.
+
+  my $old = 'cat';
+  my $new = $old =~ s/cat/dog/r;
+  # $old is 'cat' and $new is 'dog'
+
+This is particularly useful with C<map>.  See L<perlop> for more examples
+(4f4d75, 000c65).
+
+=head2 package block syntax
+
+A package declaration can now contain a code block, in which case the
+declaration is in scope only inside that block.  So C<package Foo { ... }>
+is precisely equivalent to C<{ package Foo; ... }>.  It also works with
+a version number in the declaration, as in C<package Foo 1.2 { ... }>.
+See L<perlfunc> (434da3..36f77d, 702646).
+
+=head2 CLONE_PARAMS structure added to ease correct thread creation
+
+Modules that create threads should now create C<CLONE_PARAMS> structures
+by calling the new function C<Perl_clone_params_new()>, and free them with
+C<Perl_clone_params_del()>. This will ensure compatibility with any future
+changes to the internals of the C<CLONE_PARAMS> structure layout, and that
+it is correctly allocated and initialised.
+
+=head2 perl -h no longer recommends -w
+
+perl -h used to mark the -w option as recommended; since this option is
+far less useful than it used to be due to lexical 'use warnings' and since
+perl -h is primary a list and brief explanation of the command line switches,
+the recommendation has now been removed (60eaec).
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules
+
+=head3 Locale-Codes 3.13
+
+Locale::Country, Locale::Language and Locale::Currency were updated from
+3.12 to 3.13 of the Locale-Codes distribution to include locale code changes
+(e1137b).
+
+=head3 Thread-Semaphore 2.11
+
+Added new methods -E<gt>down_nb() and -E<gt>down_force() at the suggestion
+of Rick Garlick.
+
+Refactored methods to skip argument validation when no argument is supplied.
+
+(04febe, f06daa)
+
+=head3 CPAN.pm 1.94_57
+
+=over 4
+
+=item * release 1.94_57
+
+=item * bugfix: treat modules correctly that are deprecated in perl 5.12.
+
+=item * bugfix: RT #57482 and #57788 revealed that configure_requires
+implicitly assumed build_requires instead of normal requires. (Reported
+by Andrew Whatson and Father Chrysostomos respectively)
+
+=item * testfix: solaris should run the tests without expect because (some?)
+solaris have a broken expect 
+
+=item * testfix: run tests with cache_metadata off to prevent spill over
+effects from previous test runs
+
+=back
+
+(742adb)
+
+=head3 Hash::Util warning fix
+
+Hash::Util now enables "no warnings 'uninitialized'" to suppress spurious
+warnings from undefined hash values (RT #74280).
+
+=head3 B::Deparse now handles 'no VERSION'
+
+The 'no 5.13.2' or similar form is now correctly handled by B::Deparse.
+
+=head3 IO::Socket doc additions
+
+getsockopt and setsockopt are now documented.
+
+=head3 B::Concise updated for OPpDEREF
+
+B::Concise marks rv2sv, rv2av and rv2hv ops with the new OPpDEREF flag
+as "DREFed".
+
+=head3 File::Copy doc clarification
+
+An extra stanza was added explaining behaviours when the copy destination
+already exists and is a directory.
+
+=head3 Multiple POD spelling fixes.
+
+Fixes were made to VMS::DCLsym, mro, Search::Dist, B::t::OptreeCheck
+and UNIVERSAL.
+
+=head1 Changes to Existing Documentation
+
+=head2 Replace wrong tr/// table in perlebcdic.pod
+
+perlebcdic.pod contains a helpful table to use in tr/// to convert
+between EBCDIC and Latin1/ASCII.  Unfortunately, the table was the
+inverse of the one it describes, though the code that used the table
+worked correctly for the specific example given.
+
+The table has been changed to its inverse, and the sample code changed
+to correspond, as this is easier for the person trying to follow the
+instructions since deriving the old table is somewhat more complicated.
+
+The table has also been changed to hex from octal, as that is more the norm
+these days, and the recipes in the pod altered to print out leading
+zeros to make all the values the same length, as the table that they can
+generate has them (5f26d5).
+
+=head2 Document tricks for user-defined casing
+
+perlunicode.pod now contains an explanation of how to override, mangle
+and otherwise tweak the way perl handles upper, lower and other case
+conversions on unicode data, and how to provide scoped changes to alter
+one's own code's behaviour without stomping on anybody else (71648f).
+
+=head2 Document $# and $* as removed and clarify $#array usage
+
+$# and $* were both disabled as of perl5 version 10; this release adds
+documentation to that effect, a description of the results of continuing
+to try and use them, and a note explaining that $# can also function as a
+sigil in the $#array form (7f315d2).
+
+=head2 INSTALL explicitly states the requirement for C89
+
+This was already true but it's now Officially Stated For The Record (51eec7).
+
+=head2 No longer advertise Math::TrulyRandom
+
+This module hasn't been updated since 1996 so we can't recommend it any more
+(83918a).
+
+=head2 perlfaq synchronised to upstream
+
+The FAQ has been updated to commit
+37550b8f812e591bcd0dd869d61677dac5bda92c from the perlfaq repository
+at git@github.com:briandfoy/perlfaq.git
+
+=head1 Performance Enhancements
+
+Only allocate entries for @_ on demand - this not only saves memory per
+subroutine defined but should hopefully improve COW behaviour (77bac2).
+
+=head2 Multiple small improvements to threads
+
+The internal structures of threading now make fewer API calls and fewer
+allocations, resulting in noticeably smaller object code. Additionally,
+many thread context checks have been deferred so that they're only done
+when required (although this is only possible for non-debugging builds).
+
+=head2 Size optimisations to SV and HV structures
+
+xhv_fill has been eliminated from struct xpvhv, saving 1 IV per hash and
+on some systems will cause struct xpvhv to become cache aligned. To avoid
+this memory saving causing a slowdown elsewhere, boolean use of HvFILL
+now calls HvTOTALKEYS instead (which is equivalent) - so while the fill
+data when actually required is now calculated on demand, the cases when
+this needs to be done should be few and far between (f4431c .. fcd245).
+
+The order of structure elements in SV bodies has changed. Effectively,
+the NV slot has swapped location with STASH and MAGIC. As all access to
+SV members is via macros, this should be completely transparent. This
+change allows the space saving for PVHVs documented above, and may reduce
+the memory allocation needed for PVIVs on some architectures.
+
+=head2 Optimisation of regexp engine string comparison work
+
+The foldEQ_utf8 API function for case-insensitive comparison of strings (which
+is used heavily by the regexp engine) was substantially refactored and
+optimised - and its documentation much improved as a free bonus gift
+(8b3587, e6226b).
+
+=head2 Memory consumption improvements to Exporter
+
+The @EXPORT_FAIL AV is no longer created unless required, hence neither is
+the typeglob backing it - this saves about 200 bytes per Exporter using
+package that doesn't use this functionality.
+
+=head1 Installation and Configuration Improvements
+
+=head2 Compilation improvements
+
+Fix CCINCDIR and CCLIBDIR for mingw64 cross compiler to correctly be under
+$(CCHOME)\mingw\include and \lib rather than immediately below $(CCHOME).
+
+This means the 'incpath', 'libpth', 'ldflags', 'lddlflags' and
+'ldflags_nolargefiles' values in Config.pm and Config_heavy.pl are now
+set correctly (23ae7f).
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item * Timely cleanup of SVs that are cloned into a new thread but then
+discovered to be orphaned (i.e. their owners are -not- cloned) (e42956)
+
+=item * Don't accidentally clone lexicals in scope within active stack frames in
+the parent when creating a child thread (RT #73086) (05d04d).
+
+=item * Avoid loading feature.pm when 'no 5.13.2;' or similar is
+encountered (faee19).
+
+=item * Trap invalid use of SvIVX on SVt_REGEXP when assertions are on
+(e77da3)
+
+=item * Don't stamp on $DB::single, $DB::trace and $DB::signal if they
+already have values when $^P is assigned to (RT #72422) (4c0f30).
+
+=item * chop now correctly handles perl's extended UTF-8 (RT #73246) (65ab92)
+
+=item * Defer signal handling when shared SV locks are held to avoid
+deadlocks (RT #74868) (65c742).
+
+=item * glob() no longer crashes when %File::Glob:: is empty and
+CORE::GLOBAL::glob isn't present (4984aa).
+
+=item * perlbug now always permits the sender address to be changed
+before sending - if you were having trouble sending bug reports before
+now, this should fix it, we hope (e6eb90).
+
+=item * Overloading now works properly in conjunction with tied
+variables. What formerly happened was that most ops checked their
+arguments for overloading I<before> checking for magic, so for example
+an overloaded object returned by a tied array access would usually be
+treated as not overloaded (RT #57012) (6f1401, ed3b9b, 6a5f8c .. 24328f).
+
+=item * Independently, a bug was fixed that prevented $tied-E<gt>() from
+always calling FETCH correctly (RT #8438) (7c7501)
+
+=back
+
+=head1 Changed Internals
+
+=over 4
+
+=item * The implementation of sv_dup_inc() has changed from a macro to a function.
+
+=item *
+
+The C<find_rundefsvoffset> function has been deprecated. It appeared that
+its design was insufficient to reliably get the lexical C<$_> at run-time.
+
+Use the new C<find_rundefsv> function or the C<UNDERBAR> macro instead.
+They directly return the right SV representing C<$_>, whether it's lexical
+or dynamic (789bd8 .. 03d5bc).
+
+=item *
+
+The following new functions or macros have been added to the public API:
+C<SvNV_nomg>,  C<sv_2nv_flags>, C<find_rundefsv>.
+
+=item *
+
+The C<UNDERBAR> macro now calls C<find_rundefsv>. C<dUNDERBAR> is now a
+noop but should still be used to ensure past and future compatibility.
+
+=item *
+
+The ibcmp_* functions have been renamed and are now called foldEQ,
+foldEQ_locale and foldEQ_utf8 (e6226b).
+
+=back
+
+=head1 Deprecations
+
+The following items are now deprecated.
+
+=over 4
+
+=item *
+
+Omitting a space between a regex pattern or pattern modifiers and the following
+word is deprecated.  For example, C<< m/foo/sand $bar >> will still be parsed
+as C<< m/foo/s and $bar >> but will issue a warning.
+
+=back
+
+=head1 Platform Specific Notes
+
+=head2 Recent OpenBSDs now use perl's malloc
+
+OpenBSD E<gt> 3.7 has a new malloc implementation which is mmap based
+and as such can release memory back to the OS; however for perl using
+this malloc causes a substantial slowdown so we now default to using
+perl's malloc instead (RT #75742) (9b58b5).
+
+=head1 Acknowledgements
+
+Perl 5.13.2 represents thirty days of development since Perl 5.13.1 (and
+two days of waiting around while the release manager remembered where he
+left his brain) and contains 3685 lines of changes across 194 files from
+30 authors and committers.
+
+Thank you to the following for contributing to this release:
+
+Abigail, Andreas J. Koenig, Chas. Owens, Chris 'BinGOs' Williams,
+Craig A. Berry, David Caldwell, David Golden, David Mitchell,
+Father Chrysostomos, George Greer, H.Merijn Brand, Jerry D. Hedden,
+Karl Williamson, Maik Hentsche, Matt S Trout, Nicholas Clark, Rafael
+Garcia-Suarez, Ricardo Signes, Salvador Fandino, Salvador Ortiz Garcia,
+Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic, Sullivan Beck, Tony Cook,
+Vincent Pit, Zefram, brian d foy, Ævar Arnfjörð Bjarmason
+
+Your humble release manager would like to specifically call out
+Karl Williamson for making the tests a better place to be, and Shlomi
+Fish for a passel of tiny incremental docfixes of the sort that don't get
+made often enough.
+
+=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://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 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.
+
+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 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.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view 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