[issue29053] Implement >From_ decoding on input from mbox

[bpoaugust]

bpoaugust added the comment:

The patch can be simplified by just looking for b'\n' in the last 6 chars, and caching from b'\n' if found.

This would mean more file seeking in exchange for less buffer matching.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29053>
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