https://mathr.co.uk/mandelbrot/mu-unit/#per2 got mu-unit renormalization working, the idea (reverse engineered from the code) I used from Mandel was to use 2 divided by the derivative w.r.t. z of the superstable periodic cycle (excluding the critical point z_crit = 0) as an escape radius for |f^p(z)-z_crit|.
The implementation of Mandel is a bit messy with loads of magic values (eg code does something completely different if one parameter is 65001u vs 65003u). Not many comments either.
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