code: def specialize(self, domain):
          
          if domain == self.domain:
              return self
  
          return type(self)(
              dtype=self.dtype,
              missing_value=self.missing_value,
              dataset=self._dataset.specialize(domain),
              name=self._name,
              doc=self.__doc__,
              metadata=self._metadata,
          )
docs: Specialize ``self`` to a concrete domain.