docs: def display(self, sink=None, detail='phrase'):
          """ Friendly string for volume, using sink paths. """
          if not isinstance(detail, int):
              detail = detailNum[detail]
  
          if detail >= detailNum['line'] and self.size is not None:
              size = " (%s%s)" % (
                  humanize(self.size),
                  "" if self.exclusiveSize is None else (
                      " %s exclusive" % (humanize(self.exclusiveSize))
                  )
              )
          else:
              size = ""
  
          vol = "%s %s" % (
              _printUUID(self._uuid, detail - 1),
              sink.getSendPath(self) if sink else "",
          )
  
          return vol + size