add the 5.16.1 perldelta

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+=encoding utf8
+
+=head1 NAME
+
+perl5161delta - what is new for perl v5.16.1
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.16.0 release and
+the 5.16.1 release.
+
+If you are upgrading from an earlier release such as 5.14.0, first read
+L<perl5160delta>, which describes differences between 5.14.0 and
+5.16.0.
+
+=head1 Security
+
+=head2 an off-by-two error in Scalar-List-Util has been fixed
+
+The bugfix was in Scalar-List-Util 1.23_04, and perl 5.16.1 includes
+Scalar-List-Util 1.25.
+
+=head1 Incompatible Changes
+
+There are no changes intentionally incompatible with 5.16.0 If any
+exist, they are bugs, and we request that you submit a report.  See
+L</Reporting Bugs> below.
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<Scalar::Util> and L<List::Util> have been upgraded from version 1.23 to
+version 1.25.
+
+=item *
+
+L<B::Deparse> has been updated from version 1.14 to 1.14_01.  An
+"uninitialized" warning emitted by B::Deparse has been squashed
+[perl #113464].
+
+=back
+
+=head1 Configuration and Compilation
+
+=over
+
+=item *
+
+Building perl with some Windows compilers used to fail due to a problem
+with miniperl's C<glob> operator (which uses the C<perlglob> program)
+deleting the PATH environment variable [perl #113798].
+
+=back
+
+=head1 Platform Support
+
+=head2 Platform-Specific Notes
+
+=over 4
+
+=item VMS
+
+All C header files from the top-level directory of the distribution are now
+installed on VMS, providing consistency with a long-standing practice on other
+platforms. Previously only a subset were installed, which broke non-core extension
+builds for extensions that depended on the missing include files.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+A regression introduced in Perl v5.16.0 involving
+C<tr/I<SEARCHLIST>/I<REPLACEMENTLIST>/> has been fixed.  Only the first
+instance is supposed to be meaningful if a character appears more than
+once in C<I<SEARCHLIST>>.  Under some circumstances, the final instance
+was overriding all earlier ones.  [perl #113584]
+
+=item *
+
+C<B::COP::stashlen> has been added.   This provides access to an internal
+field added in perl 5.16 under threaded builds.  It was broken at the last
+minute before 5.16 was released [perl #113034].
+
+=item *
+
+The L<re> pragma will no longer clobber C<$_>. [perl #113750]
+
+=item *
+
+Unicode 6.1 published an incorrect alias for one of the
+Canonical_Combining_Class property's values (which range between 0 and
+254).  The alias C<CCC133> should have been C<CCC132>.  Perl now
+overrides the data file furnished by Unicode to give the correct value.
+
+=item *
+
+Duplicating scalar filehandles works again.  [perl #113764]
+
+=item *
+
+Under threaded perls, a runtime code block in a regular expression could
+corrupt the package name stored in the op tree, resulting in bad reads
+in C<caller>, and possibly crashes [perl #113060].
+
+=item *
+
+For efficiency's sake, many operators and built-in functions return the
+same scalar each time.  Lvalue subroutines and subroutines in the CORE::
+namespace were allowing this implementation detail to leak through.
+C<print &CORE::uc("a"), &CORE::uc("b")> used to print "BB".  The same thing
+would happen with an lvalue subroutine returning the return value of C<uc>.
+Now the value is copied in such cases [perl #113044].
+
+=item *
+
+C<__SUB__> now works in special blocks (C<BEGIN>, C<END>, etc.).
+
+=item *
+
+Formats that reference lexical variables from outside no longer result
+in crashes.
+
+=back
+
+=head1 Known Problems
+
+There are no new known problems, but consult L<perl5160delta/Known
+Problems> to see those identified in the 5.16.0 release.
+
+=head1 Acknowledgements
+
+Perl 5.16.1 represents approximately 2 months of development since Perl
+5.16.0 and contains approximately 14,000 lines of changes across 96
+files from 8 authors.
+
+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 5.16.1:
+
+Chris 'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, Karl
+Williamson, Paul Johnson, Reini Urban, Ricardo Signes, Tony Cook.
+
+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.
+
+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.
+
+For a more complete list of all of Perl's historical contributors,
+please see the F<AUTHORS> file in the Perl source distribution.
+
+=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 L<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 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.
+
+=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