toText missing BYSETPOS

[gbulfon]

Hello, I think I found a bug.

RRule.fromString("FREQ=MONTHLY;BYSETPOS=3;BYDAY=TH;INTERVAL=3;UNTIL=20240730T220000Z").toText();

returns : 'every 3 months on Thursday until July 30, 2024' should be : 'every 3 months on 3rd Thursday until July 30, 2024'

Is the BYSETPOS check missing?