Commits on Apr 23, 2021

1. Restore crates.io's SourceId hash value to before …

   This commit restores the hash value of the crates.io `SourceId` to what
   it was before rust-lang#9384. In rust-lang#9384 the enum variants of `SourceKind` were
   reordered which accidentally changed the hash value of the `SourceId`
   for crates.io. A change here means that users with a new version of
   Cargo will have to redownload the index and all crates, which is
   something that we strive to avoid forcing.
   
   In changing this, though, it required a manual implementation of `Ord`
   to still contain the actual fix from rust-lang#9384 which is to sort `SourceKind`
   differently from how it's defined. I was curious as to why this was
   necessary since it wasn't ever necessary in the past and this led to an
   odd spelunking which turned up some interesting information. Turns out
   Rust 1.47 and after had a breaking change where Cargo would sort
   dependencies differently. This means that rust-lang#9334 *could* have been opened
   up much earlier, but it never was. We ironically only saw an issue when
   we fixed this regression (although we didn't realize we were fixing a
   regression). This means that we are now permanently codifying the
   regression in Cargo.

   

   alexcrichton committed Apr 23, 2021
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2. Clarify some versions

   

   alexcrichton committed Apr 23, 2021
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