gh-118718: Incorrect decoding of preamble in email parser #134384
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When parsing raw binary MIME message where the preamble contains UTF-8 encoded data
It seems we've found an issue with the email.parser module when parsing raw binary MIME message where the preamble contains UTF-8 encoded data
By checking if the parser policy utf-8 attribute is present and True we use that instead of falling back to the hardcoded "ascii" encoding on the TextIOWrapper.