Fix return type of pow to make it more restrictive.

[johnthagen]

Fixes #285.

[matthiaskramm]

Thanks for the PR! Could you fix the 2.7 version, as well?

[JukkaL]

As mentioned elsewhere this will potentially be bad for mypy users.
On Fri, Jun 10, 2016 at 21:43 Matthias Kramm [email protected]
wrote:

Thanks for the PR! Could you fix the 2.7 version, as well?

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[johnthagen]

@matthiaskramm Fixed 2.7 as well.

[matthiaskramm]

Jukka, I leave it up to you to merge this or not - pytype is fine with Union[float, int], but pytype overrides __builtin__.pyi with its own pyi, hence is unaffected by this change.

[gvanrossum]

Let's close this unmerged. I'll leave @285 open though, since it has important discussion.