docs: def dumps(collection: BioCCollection, pretty_print: bool = True) -> str:
      """
      Serialize ``collection`` to a BioC formatted ``str``.
  
      Args:
          collection: the BioC collection
          pretty_print: enables formatted XML
  
      Returns:
          a BioC formatted ``str``
      """
      doc = etree.ElementTree(BioCXMLEncoder().encode(collection))
      s = etree.tostring(doc, pretty_print=pretty_print, encoding=collection.encoding,
                         standalone=collection.standalone)
      return s.decode(collection.encoding)