Sweet, cmp::min_by_key and cmp::max_by_key have finally been stabilized. Was sorely missing this little convenience in Rust, as it helps express a particular id

Sweet, cmp::min_by_key and cmp::max_by_key have finally been stabilized. Was sorely missing this little convenience in Rust, as it helps express a particular idea more clearly and succinctly. Also the improvement to compile times on macOS due to the change in how debug info is stored is a nice productivity boost.