Simple63Simple63 is a module for compressing and decompressing sequences of integers along the ideas described in the 2010 paper by Anh and Moffat. Like Simple-8b technique described in that paper, Simple63 is a word-bounded, and (as the name suggests) is the result of adapting Simple-8b to work with OCaml's 63-bit integers. While using int64 integer types would have been possible, the additional boxing required to manipulate int64's make this option unappealing.