code: def _matches(field, params):
      
      fieldattrs = six.iteritems(params)
      return all(getattr(field, attr) == val for attr, val in fieldattrs)
docs: Return True if the input TypedField `field` contains instance attributes
      that match the input parameters.
  
      Args:
          field: A TypedField instance.
          params: A dictionary of TypedField instance attribute-to-value mappings.
  
      Returns:
          True if the input TypedField matches the input parameters.