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> Oh, wait, I was confusing myself. This is that new module you guys created for type hints, and this is a new object with no installed base. (Right?)
No, you were right in your previous comment...
> Help me to understand here. You want to check in a patch adding 300 new lines of C code to the types module during beta, for a speed optimization, after we've already hit beta?
> While I like speedups as much as the next guy, I would be happier if this waited for 3.6.
This speedup will mostly affect code compiled with Cython. See the following example:
 
 @asyncio.coroutine
 def coro():
 yield from ...
Cython will compile "coro" into a function, that returns a generator-like object. "asyncio.coroutine" will wrap this function, and, therefore, the optimized by Cython generator-like object will be wrapped too (to provide an __await__ method).
This patch provides a faster wrapper for such generator-like objects. Since the whole point of using Cython is to squeeze as much performance as possible, I think it's essential to have this optimization in 3.5 (or at least in 3.5.1 as Guido suggested).
It's a lot of C code, I agree. I only can say that I did my best to write very extensive unittests, and so I hope that it won't cause any trouble.