def __eq__(self, other):
        return (isinstance(other, self.__class__) and
                other.package == self.package)
def __setattr__(self, name: str, value: Any):
        """Custom __setattr__ to allow access to metrics schema fields."""

        if not self._initialized:
            object.__setattr__(self, name, value)
            return

        if name not in self._metric_fields:
            raise RuntimeError(
                'Field: {} not defined in metirc schema'.format(name))

        self._values[name] = value