code: def create(parameter_names, parameter_types, return_type):
          
          ordered_pairs = [(name, parameter_types[name]) for name in parameter_names]
          return MethodSignature(ordered_pairs, return_type)
docs: Returns a signature object ensuring order of parameter names and types.
  
          :param parameter_names: A list of ordered parameter names
          :type parameter_names: list[str]
          :param parameter_types: A dictionary of parameter names to types
          :type parameter_types: dict[str, type]
          :param return_type: The type the function returns
          :type return_type: type
          :rtype: MethodSignature