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implementation by @jrus
https://observablehq.com/@jrus/fast-peirce-quincuncial
see also the discussion at #194
Note that the default aspect is changed:
I wonder if reval should not belong to a file of its own, since it can be used also for the conformal octahedron https://observablehq.com/@jrus/conformal-octahedron?collection=@jrus/maps and more projections to come?