Is there a RFC or discussion for adding implementations of Index and IndexMut for other numeric types? I've seen only this. For unsigned types it's logical to be able to index slices (u64 on 32-bit machine should be covered by usual checks), and for signed we can just panic on negative values. In some my programs I have a noticeable amount of as usize boilerplate (I work with u8 and u16 indexes to save memory), which I would be happy to remove.
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