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I like shedding ~80 lines with is_helper, especially if you
add inline.  Otherwise, function call overhead might be
incurred for every call to C isfoo() instead of inlining the
comparison.  I dislike increasing the distinction between
ASCII and Unicode strings, although Unicode strings already
have isdecimal and isnumeric methods which ASCII strings
lack.  I would at least add iscntrl, ispunct, and isxdigit
to Unicode strings if they are added to ASCII strings.