For instance i8, i16, i32, i64, i128 all have the same functions in their impls. It seems the obvious thing to do would be to make all these functions a part of some SignedInt trait which the primitive types would then implement. Any reason why this wasn't done?
I believe the short answer is we did that, weren't sure we got it right, then crate-ified it instead. So for now everyone uses https://crates.io/crates/num-traits for this.
Weirdly, I can't actually find the part where we decided to completely remove these from std, but this is what I can find:
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See also the very recent (perhaps even still ongoing) discussion at:
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