only assign a new value to $_, but also remove all existing magic from
it as well.
+=head3 Parsing of package and variable names
+
+The parsing of the names of packages and package variables has changed, in
+that multiple adjacent pairs of colons (as in foo::::bar) are all treated
+as package separators.
+
+Regardless of this change, the exact parsing of package separators has
+never been guaranteed and is subject to change in future Perl versions.
+
=head2 Changes to Syntax or to Perl Operators
=head3 C<given> return values
no longer attached to the symbol table. This avoids memory leaks in some
cases [perl #87664].
+=item *
+
+Subroutines and package variables inside a package whose name ends with
+"::" can now be accessed with a fully qualified name.
+
=back
=head2 Unicode