Tween from rectangle to equilateral triangle

I know this is pretty basic. How do i tween this rectangular panel to a equilateral triangle?
tween geometry.3dm (91.9 KB)

Theoretically this is impossible since a rectangle is defined by 4 vertices and a triangle by only 3. During the tween one vertex would have to be deleted or added.

Practically, it can be achieved like this:

However, weird stuff is happening in terms of the vertex count of each polyline.

These odd things are the reason I started to develop Pufferfish. (7.9 KB)

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