a version number in the declaration, as in C<package Foo 1.2 { ... }>.
See L<perlfunc> (434da3..36f77d, 702646).
+=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 New Platforms
XXX List any platforms that this version of perl compiles on, that previous