docs: def most_recent_common_ancestor(self, *ts):
          """Find the MRCA of some tax_ids.
  
          Returns the MRCA of the specified tax_ids, or raises ``NoAncestor`` if
          no ancestor of the specified tax_ids could be found.
          """
          if len(ts) > 200:
              res = self._large_mrca(ts)
          else:
              res = self._small_mrca(ts)
  
          if res:
              (res,), = res
          else:
              raise NoAncestor()
          return res