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When a value contained an XML declaration naming some other encoding, this function interpreted UTF8 bytes as the named encoding, yielding mojibake. xml_parse() already has similar logic. This would be necessary but not sufficient for non-UTF8 databases, so preserve behavior there until the xpath facility can support such databases comprehensively. Back-patch to 9.3 (all supported versions). Pavel Stehule and Noah Misch Discussion: https://postgr.es/m/CAFj8pRC-dM=tT=QkGi+Achkm+gwPmjyOayGuUfXVumCxkDgYWg@mail.gmail.com