Documentation for routine tc

Documentation for routine tc, assembled from the following types:

Str.tc

From Str

tc

multi sub    tc(Str:D ) returns Str:D
multi method tc(Str:D:) returns Str:D

Does a Unicode "titlecase" operation, that is changes the first character in the string to title case, or to upper case if the character has no title case mapping

(Not implemented in Rakudo and Niecza)