Consistent constants #73

Job	Run time
--enable-hpcombi --disable-eigen (macOS-latest)	42s
--disable-hpcombi --disable-eigen (ubuntu-latest)	8m 47s
--enable-hpcombi --disable-eigen (ubuntu-latest)	8m 23s
--disable-hpcombi --enable-eigen (ubuntu-latest)	8m 54s
--disable-hpcombi --disable-eigen (macOS-latest)	5m 40s
--disable-hpcombi --enable-eigen (macOS-latest)	7m 52s
	40m 18s

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