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Ctype (0.01) *

It is unclear why this module is necessary. All of the tests it provides can be realized by a pattern match using POSIX character classes, so this module's isxdigit() function (as an example) can be replaced by matching against /[[:xdigit:]]/. For upper- and lowercasing, Perl has builtin functions which are much shorter to type. In other words, there is nothing here which plain Perl doesn't already do.