Replace invalid characters in XML output #376
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Control characters, U+FFFE and U+FFFF aren't allowed in XML 1.0, so replace them with U+FFFD (replacement character). This doesn't solve the problem how to roundtrip these characters, but at least we don't produce invalid XML. See commonmark#365.
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Control characters, U+FFFE and U+FFFF aren't allowed in XML 1.0, so
replace them with U+FFFD (replacement character). This doesn't solve
the problem how to roundtrip these characters, but at least we don't
produce invalid XML. See #365.