What was the rationale behind making size of pointer and usize the same?

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I think the answer to this is no. And to elaborate: usize was created at a time when Rust was still quite experimental, and something like this with no practical consequences was far down the list of things to fix. Take a look at the Rust changelog and see the vast number of things that have been changed since the 1.0 release, and the even more drastic changes that were happening prior to that https://github.com/rust-lang/rust/blob/master/RELEASES.md

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I did manage to track down the origin of the name to RFC 544 (Dec '14), which changed int to isize and uint to usize.

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