Restriction #1: A polygon's first 3 vertices must form a triangle

Restriction #1: A polygon's first 3 vertices must form a triangle
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The triangle can be extremely shallow. This is legal:

POLYSTART
MAKE "savepos POSXYZ
FORWARD 100
RIGHT   0.00000001 ; very small angles are okay
FORWARD 100
SETPOSXYZ :savepos
POLYEND

This is NOT legal (even though it produces a convex polygon):

POLYSTART
MAKE "savepos POSXYZ
FORWARD 50
FORWARD 50 ; error can't have straight angles
RIGHT   90
FORWARD 100
SETPOSXYZ :savepos
POLYEND