Documentation for sub tc, assembled from the following types:
sub tc(Str(Cool))method tc()
Coerces the invocant (or in sub form, its argument) to Str, and returns it with the first letter case-folded to title case (or where not available, upper case).
say "abC".tc; # OUTPUT: «AbC␤»
multi sub tc(Str --> Str)multi method tc(Str: --> Str)
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