[issue1744398] Improve exception pickling support

[Georg Brandl]

Georg Brandl added the comment:

Closing in favor of #1692335.

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nosy: +gbrandl
status: open -> closed
superseder:  -> Move initial args assignment to BaseException.__new__

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1744398>
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