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decode_header() takes a header value string and returns a sequence of
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character set for all subsequent .append() calls that omit the charset
argument. If charset is not provided in the constructor, the us-ascii
charset is used both as s's initial charset and as the default for
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header which isn't included in s, e.g. `Subject') pass in the name of
the field in header_name. The default maxlinelen is 78 as recommended
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syntactic breaks': split points preceded by a splitchar are preferred
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