Modify replacement properties of encodeStringUtf8/decodeStringUtf8
#4928
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This changes `decodeStringUtf8` to not replace U+FFFE and U+FFFF into U+FFFD, while `encodeStringUtf8` now replaces surrogate pairs (i.e. code-points U+D800 through U+DFFF which are invalid in UTF-8) with U+FFFD. Consequently, `decodeStringUtf8 . encodeStringUtf8` can now properly round-trip all scalar code-points (i.e. [U+0000..U+D7FF] ∪ [U+E000..U+10FFFF]). This should finally address haskell#4644
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Merged, thanks! |
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This should finally address #4644
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