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Make sure that some stdlib method signatures aren't accidental refinements In the process of implementing https://rust-lang.github.io/rfcs/3245-refined-impls.html, I found a bunch of stdlib implementations that accidentally "refined" their method signatures by dropping (unnecessary) bounds. This isn't currently a problem, but may become one if/when method signature refining is stabilized in the future. Shouldn't hurt to make these signatures a bit more accurate anyways. NOTE (just to be clear lol): This does not affect behavior at all, since we don't actually take advantage of refined implementations yet!