Thank, Ingo - for this and all the other attached work.
The spline + shape from the docs is very informative.

The sor is a centripetal Catmull rom cubic Hermite spline with a tension, or
exponent of 0.5.

I'm not sure what cubic_spline is, but having played with that one in the past,
it may not be.  I'm pretty sure that TOK has implemented the natural cubic
spline.

I'll have to pull up github or the 3.7 source on my local machine and hunt down
all of the implementations of spline types so that I can find out where they all
are and accurately classify them.

Thet really need to be all in one place, and not buried inside specific shapes
like CR is with sor.

- BW

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