Sinon: Request: Syntactic sugar for combining calledOnce and calledWithExactly

Hi guys, great library. I'd like to request a feature regarding spies. If using them, we most likely want to make sure that the spy is called exactly as expected by using calledWithExactly. We also want to make sure this happens only a single time by using calledOnce. Of course, this is possible right now. But I think it should be the default assertion (compared to partial matching) and therefore it would be great if boilerplate could be reduced by introducing a combined method like onceCalledWithExactly or calledOnceWithExactly. What do you think?

Example

Using sinon-chai, this ...

expect(mySpy).calledOnce.and.calledWithExactly(expectedValue);

could be replaced by this:

expect(mySpy).calledOnceWithExactly(expectedValue);