6ed1a67b38
Allow comparing `Vec`s with different allocators using `==` See https://stackoverflow.com/q/71021633/7884305. I did not changed the `PartialOrd` impl too because it was not generic already (didn't support `Vec<T> <=> Vec<U> where T: PartialOrd<U>`). Does it needs tests? I don't think this will hurt type inference much because the default allocator is usually not inferred (`new()` specifies it directly, and even with other allocators, you pass the allocator to `new_in()` so the compiler usually knows the type). I think this requires FCP since the impls are already stable.