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The various C<gv_fetchmeth_*> XS functions used to treat a package whose
named ended with C<::SUPER> specially.  A method lookup on the C<Foo::SUPER>
package would be treated as a C<SUPER> method lookup on the C<Foo> package.  This
is no longer the case.  To do a C<SUPER> lookup, pass the C<Foo> stash and the
C<GV_SUPER> flag.

=head2 C<split>'s first argument is more consistently interpreted

After some changes earlier in v5.17, C<split>'s behavior has been
simplified: if the PATTERN argument evaluates to a string
containing one space, it is treated the way that a I<literal> string
containing one space once was.

=head1 Deprecations

=head2 Module removals

The following modules will be removed from the core distribution in a future
release, and will at that time need to be installed from CPAN. Distributions
on CPAN which require these modules will need to list them as prerequisites.

The core versions of these modules will now issue C<"deprecated">-category
warnings to alert you to this fact. To silence these deprecation warnings,
install the modules in question from CPAN.

Note that these are (with rare exceptions) fine modules that you are encouraged
to continue to use. Their disinclusion from core primarily hinges on their
necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
not usually on concerns over their design.

=over

=item L<encoding>

The use of this pragma is now strongly discouraged. It conflates the encoding
of source text with the encoding of I/O data, reinterprets escape sequences in
source text (a questionable choice), and introduces the UTF-8 bug to all runtime
handling of character strings. It is broken as designed and beyond repair.

For using non-ASCII literal characters in source text, please refer to L<utf8>.
For dealing with textual I/O data, please refer to L<Encode> and L<open>.

=item L<Archive::Extract>

=item L<B::Lint>

=item L<B::Lint::Debug>

=item L<CPANPLUS> and all included C<CPANPLUS::*> modules

=item L<Devel::InnerPackage>

=item L<Log::Message>

=item L<Log::Message::Config>

=item L<Log::Message::Handlers>

=item L<Log::Message::Item>

=item L<Log::Message::Simple>

=item L<Module::Pluggable>

=item L<Module::Pluggable::Object>

=item L<Object::Accessor>

=item L<Pod::LaTeX>

=item L<Term::UI>

=item L<Term::UI::History>

=back

=head2 Deprecated Utilities

The following utilities will be removed from the core distribution in a
future release as their associated modules have been deprecated. They
will remain available with the applicable CPAN distribution.

=over

=item L<cpanp>

=item C<cpanp-run-perl>

=item L<cpan2dist>

These items are part of the C<CPANPLUS> distribution.

=item L<pod2latex>

This item is part of the C<Pod::LaTeX> distribution.

=back

=head2 PL_sv_objcount

This interpreter-global variable used to track the total number of
Perl objects in the interpreter. It is no longer maintained and will
be removed altogether in Perl v5.20.

=head2 Five additional characters should be escaped in patterns with C</x>

When a regular expression pattern is compiled with C</x>, Perl treats 6
characters as white space to ignore, such as SPACE and TAB.  However,
Unicode recommends 11 characters be treated thusly.  We will conform
with this in a future Perl version.  In the meantime, use of any of the
missing characters will raise a deprecation warning, unless turned off.
The five characters are:

    U+0085 NEXT LINE
    U+200E LEFT-TO-RIGHT MARK
    U+200F RIGHT-TO-LEFT MARK
    U+2028 LINE SEPARATOR
    U+2029 PARAGRAPH SEPARATOR

=head2 User-defined charnames with surprising whitespace