This bitvec I wrote for Servo and Gecko uses this technique, and has been shipping in Firefox releases for over six years with no bugs found: https://docs.rs/s

This bitvec I wrote for Servo and Gecko uses this technique, and has been shipping in Firefox releases for over six years with no bugs found: https://docs.rs/smallbitvec/ https://docs.rs/smallbitvec/ I'm pretty sure you can find several more examples in Firefox, as well as other major browsers.