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What should be done about concatenation, in view of the fact that concatenation can often break normalization?

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What should be done about concatenation, in view of the fact that concatenation can often break normalization?

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While it is true that none of the normalization forms are closed under string concatenation, an optimized concatenation function can be written to produce a normalized concatenation from normalized strings. This is possible, because at most a few characters in the immediate area of the adjoined strings need processing. See the Introduction of UAX #15.

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