[klysm]

Yeah it doesn't make sense to pick something that's not a power of 2 unless you are packing it.

[postalrat]

I guess that depends on how the index works.

[gfody]

we usually work with some page size anyways, 64 5-byte ints fit nicely into 5 512-bit registers, and ~1T is a pretty flexible cardinality limit after ~2B