[issue19730] Clinic fixes: add converters with length, version directive

[Antoine Pitrou]

Antoine Pitrou added the comment:

Argument Clinic is an internal tool, so I don't think it's bound by the feature freeze.
(and, besides, you are the RM :-))

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19730>
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