From type/Uni

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method NFKD(Uni:D: --> NFKD:D)

Returns a NFKD (Normal Form Compatibility Decomposed)-converted version of the invocant.

From type/Str

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method NFKD(Str:D: --> NFKD:D)

Returns a codepoint string in NFKD format (Unicode Normalization Form KD / Compatibility Decomposed).