Sets a parameter in the embedded param map.

def set(self, param, value):
        """
        Sets a parameter in the embedded param map.
        """
        self._shouldOwn(param)
        try:
            value = param.typeConverter(value)
        except ValueError as e:
            raise ValueError('Invalid param value given for param "%s". %s' % (param.name, e))
        self._paramMap[param] = value