[S15] Clarify values the uniprops hash can contain
[S15] Clarify values the uniprops hash can contain

Based off the value types defined in UAX#44, §5.2, the mapping is now
thus:

    B → Bool
    N → Rat
    C, E, S, M → Str

Though perhaps the 'E'numeration types could actually be Enums, if the
benefits of codifying them as enumerations is worth it.

tokuhirom/specs,perl6/specs,tokuhirom/specs,prammer/specs,perl6/specs,prammer/specs,tokuhirom/specs,prammer/specs