Scheme Request for Implementation 151, "Bitwise Operations," by John Cowan, has gone into "final" status.
The document and an archive of the discussion are available at <https://srfi.schemers.org/srfi-151/>. Here's the first paragraph of the abstract: This SRFI proposes a coherent and comprehensive set of procedures for performing bitwise logical operations on integers; it is accompanied by a reference implementation of the spec in terms of a set of seven core operators. The sample implementation is portable, as efficient as practical with pure Scheme arithmetic (it is much more efficient to replace the core operators with C or assembly language if possible), and open source. Regards, SRFI Editor
