Trying to debug why shallow zooms in and/or disabling series approximation causes weird artifacts where the directional analytic distance estimate used for fake lighting effects ("slope colouring") doesn't line up between successive frames when rendering exponential maps, causing bad seams.

At deep zooms with series approximation, Mandelbrot set is fine, but other fractals are still buggy (I tested Burning Ship and Buffalo).

Today I implemented analytic DE for the hybrid fractal formula editor using dual numbers, and it has no problems whatsoever.

My current temptation is to delete most of the old formulas (given that they are at least partially broken) and replace them with example settings for the hybrid editor. Will have to benchmark this carefully in case it's too much slower.

But I need to fix the Mandelbrot set implementation, as using it without series approximation is much slower.

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