From type/Uni

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method NFKC(Uni:D: --> NFKC:D)

Returns a NFKC (Normal Form Compatibility Composed)-converted version of the invocant.

From type/Str

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method NFKC(Str:D: --> NFKC:D)

Returns a codepoint string in NFKC format (Unicode Normalization Form KC / Compatibility Composed).