def has_stable_releases(self):
        """
        Returns whether stable (post-0.x) releases seem to exist.
        """
        nonzeroes = self.stable_families
        # Nothing but 0.x releases -> yup we're prehistory
        if not nonzeroes:
            return False
        # Presumably, if there's >1 major family besides 0.x, we're at least
        # one release into the 1.0 (or w/e) line.
        if len(nonzeroes) > 1:
            return True
        # If there's only one, we may still be in the space before its N.0.0 as
        # well; we can check by testing for existence of bugfix buckets
        return any(
            x for x in self[nonzeroes[0]] if not x.startswith('unreleased')
        )
Returns whether stable (post-0.x) releases seem to exist.