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Use Unicode full case folding and NFC normalization for file name uniqueness comparisons
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The previous wording was vague about what case normalization to use and allowed either NFC or NFD normalization.
See https://github.com/w3c/epub-specs/issues/1631
This requirement was further changed in https://github.com/w3c/epub-specs/pull/1648
The new prose is: "All File Names within the same directory MUST be unique following Unicode normalization [UAX15] and then full case folding [Unicode]".