allow yielding exception instances from async generators (previously interpreted them as actual exceptions)
allow yielding exception instances from async generators (previously interpreted them as actual exceptions)

cython/cython,scoder/cython,da-woods/cython,cython/cython,cython/cython,scoder/cython,da-woods/cython,scoder/cython,scoder/cython,da-woods/cython,cython/cython,da-woods/cython