I have always wondered what the big deal about negative values was, since once
it gets revolved 180 degrees, it's the positive value.

Can the on-curve points simply be redefined to be positive?
on_curve[n] = abs(original_curve[n]) ?

I could of course, be way off base with this.


The pre-evaluation of the on-curve points for things like Bezier curves would be
an extra subroutine and parser hog, but probably shouldn't be too bad unless
there were a lot of such objects to evaluate.

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