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Curve edges of an object either outside or inside.
Size percentage = 0%
A curvature of edges.
Values
{positive value} # curves edges inside themselves
0 # no change
{negative value} # curves edges outside
Making object look like a flower (if Size is negative) or a star (if it's positive).
Make all properties visually editable and snappable. Let users see how object handles are curved and let them be distorted on the canvas.