[issue21076] Turn signal.SIG* constants into enums

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Now signal.signal() accepts inappropriate types.

>>> signal.signal(signal.SIGHUP, 0.0)
<Handlers.SIG_DFL: 0>
>>> signal.signal(signal.SIGHUP, '0')
<Handlers.SIG_DFL: 0>

In 3.4 it raised an exception.

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status: closed -> open

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<http://bugs.python.org/issue21076>
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