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caeaa662ab
Previously, mbstring would accept a lot of things which were not valid UHC text. No more. - Don't allow single-byte control characters to appear where the 2nd byte of a multi-byte character should be. - Validate that the 2nd byte of a multi-byte character is in the expected range. - Treat it as an error if a multi-byte character is truncated. Also add a test suite to confirm that UHC conversion (both to and from Unicode) works according to spec.