Josh Rosenberg added the comment:

I'm not a core developer, but writing the patch is usually considered helpful. 
Two notes:

1. Make sure to write unit tests for any new behavior
2. I'd suggest making any such argument keyword-only; if we move closer to the 
Java executor model, that means having a lot of options, the majority of which 
would be left as the default by users. Binding the API to a particular argument 
order is sub-optimal (it makes it even harder to deprecate arguments for 
instance), so enforcing keyword only behavior ensures users can't write call 
lines that take dependencies on argument ordering.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21423>
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