I was thinking SplineX might be using coefficients chosen by visual trial and error, rather than mathematical nth degree derivative continuity ("optimal" method).
So either:
1. The developers simply don't know what they're doing
2. The developers genuinely thought their version produced better results
3. We're missing something-- perhaps there's a more complicated answer.
Either way, it would be very interesting to see how splineX's implementations match up with the mathematically optimal ones.
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