[css-flexbox] which margin definition for intrinsic sizing?

Hello!

Question about https://drafts.csswg.org/css-flexbox/#intrinsic-main-sizes

This algorithm wants to use the outer flex base size. But in general, for
intrinsic sizing purposes, percentage margins get treated as zero. Should
that be used here as well?

Also, is there a reason why min-size is ignored for the purpose of this
algorithm?

thanks,
-Christian