> Right, it's just the Thread/Process API equivalance.  I'm not saying
> it's a stopper, but the docs would probably need to be modified
> accordingly.
I'm a bit confused here. The patch only adds a small feature to
BaseManager and subtypes (the same way Pool does it already). AFAICT the
Thread/Process API equivalence is preserved. Am I missing something?

This patch should be better:
- checks that initializer is a callable, raise TypeError if not (do it
for Pool.__init__ also).
- adds tests for Pool.__init__ and SyncManager.start