If there are no case mappings for the L</code point argument>, or if all three
possible mappings (I<lower>, I<title> and I<upper>) result in single code
-points and are locale independent and uncondtional, B<undef> is returned.
+points and are locale independent and unconditional, B<undef> is returned.
Otherwise, a reference to a hash giving the mappings (or a reference to a hash
of such hashes, explained below) is returned.