[issue3182] 2to3 Slight Patch

[Collin Winter]

Collin Winter <collinw at gmail.com> added the comment:

So, revisiting this...

On the face of it, I'm not convinced that the isinstance(x, Leaf) ->
type(x) is Leaf changes are correct: certain fixers have in the past
utilized their own subclasses of Node, and I can foresee this being done
again in the future. Reverting those changes seems to remove the speedup
you observed.

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