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With the PR merged today, spline (not spline through points, which is actually second order Béziers) can be edited for:
Control points, weights, and knot vector.
Please note, some features may be still need more fixes.
I also started the math for fitting: so it's possible to have spline fitting finally.
Not changed: the spline is still by line segment approximation. To draw actually spline would require lots of development time. Probably, not an urgency.
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