This page is part of the web mail archives of SRFI 33 from before July 7th, 2015. The new archives for SRFI 33 contain all messages, not just those from before July 7th, 2015.
On closer reading, SRFI 47 already has at1 array prototypes for creating arrays of booleans. I think that's a much better point than integers to hang bitwise operations on. Bear