Pre-RFC: `usize` semantics

language design Unsafe Code Guidelines
111

I generally agree, but I would like to add the following:

  • The proposed mechanism should be general enough, e.g. it should allow the winapi/windows-* crates to specify that they can work only on Windows targets.
  • I think conditionally allowing From<u32> for usize impl looks somewhat similar to this proposal. It would be nice to have the same tooling for both these usecases.
  • We will need a rough outline of how the defaults would change in future editions. I don't think we should make the "not-CHERI" condition a default one, i.e. crates should have to explicitly opt out of CHERI support.
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