Well Rust and npm happened in that time. I don't have much experience with the latter but I know of the former that despite promises of semantic versioning, it

Well Rust and npm happened in that time. I don't have much experience with the latter but I know of the former that despite promises of semantic versioning, it is quite common for a crate to not work with a newer version, requiring one to hard depend on a specific version. Add to that that Rust's definition of “non-breaking change” in theory can include changes that A) read to compilation errors or B) compile fine but lead to different behavior.