In `EvKey`, compare voxels better. #633

Job	Run time
miri	1m 51s
incremental-mutants	0s
deny	42s
build (ubuntu, stable, locked, true)	12m 37s
no_std	39s
build (windows, stable, locked, false)	22m 34s
build (macos, stable, locked, false)	10m 25s
build (ubuntu, nightly, locked, false)	22m 27s
build (ubuntu, beta, locked, false)	13m 28s
build (ubuntu, stable, latest, false)	15m 54s
build (ubuntu, stable, minimal, false)	1m 14s
features	29m 39s
fuzz	15m 43s
deploy	8s
	2h 27m 21s

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