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Support "full" case mapping in Strings: toLower/toUpper #3437

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@pbiggar

toLower and toUpper don't work for strings where the converted string has a different number of EGCs than the original. For example:

String.toUppercase_v1 "fifl" = "FIFL"

See

// FSTODO: There are two types of unicode case "mapping" (conversion), "simple"
for discussion.

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