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Are there any exceptions to idempotency for Unicode normalization?

April 26, 2017exceptions Normalization Unicode

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Are there any exceptions to idempotency for Unicode normalization?

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For earlier versions of Unicode, between Version 3.0 and Version 4.0.1, in some exceptional situations, normalization would have to be applied twice before further applications would no longer change the data. This situation was addressed in Corrigendum #5.