C<\N{123}> means to match 123 non-newline characters, and is not treated as an
alias. Aliases are discouraged from beginning with anything other than an
alphabetic character and from containing anything other than alphanumerics,
-spaces, dashes, colons, parentheses, and underscores.
+spaces, dashes, colons, parentheses, and underscores. Currently they must be
+ASCII.
=head2 Anonymous hashes
None of the functions work on almost all the Hangul syllable and CJK Unicode
characters that have their code points as part of their names.
+Names must be ASCII characters only.
+
Unicode standard named sequences are not recognized, such as
C<LATIN CAPITAL LETTER A WITH MACRON AND GRAVE>
(which should mean C<LATIN CAPITAL LETTER A WITH MACRON> with an additional