http://bugs.python.org/review/27689/diff/18074/Doc/library/typing.rst File Doc/library/typing.rst (right): http://bugs.python.org/review/27689/diff/18074/Doc/library/typing.rst#newcod... Doc/library/typing.rst:474: while sent is not None: On 2016/08/05 20:15:15, levkivskyi wrote:

One more comment: One might be confused why send type is float and not Optional[float], maybe you could add an explanation that one anyway can only send None as a first value, so that Optional is redundant.

Hm, that initial None is not given to yield (it just starts execution of the generator body). This code really needs Optional[float] in the signature, if that's used as the sentinel (once we have strict optional checking). http://bugs.python.org/review/27689/