Fair enough. But tbh I'm not sure it really matters in this context. It's just a constant that means "ignore this parameter". Whether it's "a really big number"

Fair enough. But tbh I'm not sure it really matters in this context. It's just a constant that means "ignore this parameter". Whether it's "a really big number" or "a bunch of bits that are all 1s" is incidental. Btw, you can directly express "all ones" in Rust as: 0b_1111_1111_1111_1111_1111_1111_1111_1111 Though it's somewhat less succinct. ;) EDIT: Added more ones, thanks adwn!