[issue2121] complex constructor doesn't accept string with nan and inf

[Mark Dickinson]

Mark Dickinson added the comment:

Signed zeros cause difficulties with round-tripping, too:

>>> z = complex(-0.0, -0.0); w = complex(repr(z))
>>> z
-0j
>>> w
-0j
>>> z.real
-0.0
>>> w.real
0.0

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nosy: +marketdickinson

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