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Only a few codepoints have a mapping in CaseFolding.txt but do not have the Changes_When_Casefolded property set. So, FoldData can just store a list of those particular codepoints and then re-use the encoded CaseFolding.txt data alongside it in order to implement changesWhenCaseFolded.
This reduces the size of fold.bin.z from 4,387 bytes (4.28KiB) to 1,165 bytes (1.13KiB).
This also seemingly introduced a very slight performance regression in zg_caseless.
Before:
zg CaseFold.compatCaselessMatch: result: 626, took: 258ns
zg CaseFold.canonCaselessMatch: result: 626, took: 129ns
After:
zg CaseFold.compatCaselessMatch: result: 626, took: 263ns
zg CaseFold.canonCaselessMatch: result: 626, took: 131ns
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