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tc
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine tc 

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 titlecase (or where not available, uppercase).

say "abC".tc;       # OUTPUT: «AbC␤»

In Str§

See primary documentation in context for routine tc 

multi        tc(Str:D  --> Str:D)
multi method tc(Str:D: --> Str:D)

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

In Allomorph§

See primary documentation in context for method tc 

method tc(Allomorph:D:)

Calls Str.tc on the invocant's Str value.