Temporary canonical multihash in peer ID. #1449
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Together with #1444 this is a proposal for a possible resolution of the remaining issues relating to #555, including #1437.
The idea would be to publish #1444 with
0.16and the changes of this PR with0.17. #1444 should resolve #1437 and this PR should ensure that it stays resolved once we start using the "identity hash". Then, eventually, thecanonicalfield introduced here could be removed in0.18or later.In the context of this PR, the general lack of guarantees w.r.t.
AsRef<[u8]>,PeerId::as_bytes()andPeerId::into_bytes()is now documented, and implementations ofstd::borrow::Borrowadded which do provide the necessary guarantees. Similarly, construction ofKeys inlibp2p-kadis changed from requiringAsRef<[u8]>toBorrow<[u8]>to more clearly state the requirements.I hope this makes sense and is sound, please let me know if it doesn't.