gered
            as a result of the declared state transition.
        :param Callable collector: The function to be used when collecting
            output return values.

        :raises TypeError: if any of the `outputs` signatures do not match
            the `inputs` signature.
        :raises ValueError: if the state transition from `self` via `input`
            has already been defined.
        zdmethod {input} signature {inputSignature} does not match output {output} signature {outputSignature})