zeros to make all the values the same length, as the table that they can
generate has them.
+=head2 Document tricks for user-defined casing
+
+perlunicode.pod now contains an explanation of how to override, mangle
+and otherwise tweak the way perl handles upper, lower and other case
+conversions on unicode data, and how to provide scoped changes to alter
+one's own code's behaviour without stomping on anybody else (71648f).
+
=head1 Performance Enhancements
Only allocate entries for @_ on demand - this not only saves memory per