Optimise internal fallback method calls in Py3.7+ by directly unpacking the method calls. Closes #2850.
Optimise internal fallback method calls in Py3.7+ by directly unpacking the method calls.
Closes #2850.

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