I suppose that my next logical question is:

the sor documentation states, "The intersection test with a SOR object involves
solving a cubic polynomial while the test with a lathe object requires to solve
a 6th order polynomial" ...

but upon reviewing the lathe documentation, one can choose between a variety of
different spline types.

So perhaps that needs some clarification / correction / expansion.

(I've also written a Newton-Raphson root solver, and so probably should
investigate the Sturmian root solver.)

- BW

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