(C<< my $k = \&CORE::keys; $k-E<gt>(\%hash) >>). Previously they could only be
used when inlined.
-=head2 create a safer utf8_hop() called utf8_hop_safe()
+=head2 for XS code, create a safer utf8_hop() called utf8_hop_safe()
Unlike utf8_hop(), utf8_hop_safe() won't navigate before the beginning or after
the end of the supplied buffer.