parameters: ()
return_statement: return Optional(StrSerde())
docstring: Return an optional str serde.
docstring_summary: Return an optional str serde.
docstring_tokens: Return an optional str serde .
function: def str_():
      """
          Return an optional str serde.
      """
      return Optional(StrSerde())
function_tokens: def str_ ( ) : return Optional ( StrSerde ( ) )