Dispatching to a different method seems like a no brainer indeed. The question is whether we really need to do this in C. Maybe for some very specific case or cases it makes sense to have a super fast C path, e,g. no weights and bins is an integer. Even then, rather than rewriting the whole thing in C, it may be a better idea to leave the parsing of the inputs in Python, and have a C helper function wrapped and privately exposed, similarly to how `np.core.multiarray.interp` is used by `np.interp`.

But I would still first give it a try in Python...

Jaime