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fc
Combined from primary sources listed below.

In Cool§

See primary documentation in context for routine fc 

sub fc(Str(Cool))
method fc()

Coerces the invocant (or in sub form, its argument) to Str, and returns the result a Unicode "case fold" operation suitable for doing caseless string comparisons. (In general, the returned string is unlikely to be useful for any purpose other than comparison.)

say "groß".fc;       # OUTPUT: «gross␤»

In Str§

See primary documentation in context for routine fc 

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

Does a Unicode "fold case" operation suitable for doing caseless string comparisons. (In general, the returned string is unlikely to be useful for any purpose other than comparison.)

In Allomorph§

See primary documentation in context for method fc 

method fc(Allomorph:D:)

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