docs: def default_versions(self, default_versions):
          '''
          Set archive default read versions
  
          Parameters
          ----------
          default_versions: dict
              Dictionary of archive_name, version pairs. On read/download,
              archives in this dictionary will download the specified version
              by default. Before assignment, archive_names are checked and
              normalized.
          '''
  
          default_versions = {
              self._normalize_archive_name(arch)[1]: v
              for arch, v in default_versions.items()}
  
          self._default_versions = default_versions