Sit Spins under ISI - Judging?

[scarlet-feather]

Was wondering if, according to ISI judging criteria, straight-legged sit spins are preferred over bent-legged ones?

Is it a hard and fast rule, or is it up to the judges' preferences?

[Doubletoe]

Since nobody has answered, I'll just say that the ISI website shows an example of their test sit spin with the skater's free leg slightly bent.  Although a straight free leg is traditionally preferred, there is no mention of it in the criteria listed in the video for the 4th test, here:
  http://www.skateisi.com/site/sub.cfm?content=testing_requirements#7