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Only first 256 wide chars are considered currently, all other are just dropped from the range. Proper implementation require reverse tables database lookup, since objects are really big as max UTF-8 (1114112 code points), so just the same scanning as it was for 256 chars will slow things down. POSIX does not require collation for [a-z] type ranges and does not prohibit it for non-POSIX locales. POSIX require collation for ranges only for POSIX (or C) locale which is equal to ASCII and binary for other chars, so we already have it. No other *BSD implements collation for [a-z] type ranges. Restore ABI compatibility with unused now __collate_range_cmp() which is visible from outside (will be removed later).
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