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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 760ccd78e874 by Larry Hastings in branch 'default':
Issue #19730: Argument Clinic now supports all the existing PyArg
http://hg.python.org/cpython/rev/760ccd78e874

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nosy: +python-dev

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<http://bugs.python.org/issue19730>
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