Rhinocommon Curve Offset logic

Hi, when I use the version of the Curve Offset method that takes a plane and a distance, not a direction point, how does it determine which way the offset goes? I just plugged some stuff in and so far it’s giving me the solution I want, but that would seem to be just a happy accident.

It uses curve direction to decide which side the offset goes. You will see it yourself if you use flip curve component

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