Chained onCall and withArgs doesn't work

[jonathan-benn]

stub = sinon.stub()
stub.withArgs(42).onFirstCall().returns(1).onSecondCall().returns(2)
stub.returns(0);
assert stub(1) == 0
assert stub(42) == 1 # fails, returns 0
assert stub(1) == 0
assert stub(42) == 2
assert stub(1) == 0
assert stub(42) == 0

[jonathan-benn]

This is issue is not the same as #22

[jonathan-benn]

I am working on this now

[jonathan-benn]

This one is difficult to solve, I am still working on it

[jonathan-benn]

I finished the first part of a solution. I will clean it up and submit on Monday.