[issue21492] email.header.decode_header sometimes returns bytes, sometimes str

[Berker Peksag]

Berker Peksag added the comment:

> >>> email.header.decode_header("foo")
> [('foo', None)]

email.header.decode_header() implements rfc-2047 and the "foo" header doesn't match the syntax described in rfc-2047 (see "2. Syntax of encoded-words").

See the code for more information:

* http://hg.python.org/cpython/file/default/Lib/email/header.py#l34
* http://hg.python.org/cpython/file/default/Lib/email/header.py#l81

See the "6.1. Recognition of 'encoded-word's in message headers" section at http://www.rfc-base.org/txt/rfc-2047.txt

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components: +email
nosy: +barry, berker.peksag, r.david.murray

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<http://bugs.python.org/issue21492>
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