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Implement the fc keyword and the \F string escape.
Along with the simple_casefolding and full_casefolding features.
fc() stands for foldcase, a sort of pseudo case (like lowercase),
which is used to implement Unicode casefolding. It maps a string
to a form where all case differences are erased, so it's a
locale-independent way of checking if two strings are the same,
regardless of case.
This functionality was, and still is, available through the
regular expression engine -- /i matches would use casefolding
internally. The fc keyword merely exposes this for easier access.
Previously, one could attempt to case-insensitively test two strings
for equality by doing
lc($a) eq lc($b)
But that might get you wrong results, for example in the case of
\x{DF}, LATIN SMALL LETTER SHARP S.
18 files changed: