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15fbd2f607
initial version of checksum based freshness Implementation for https://github.com/rust-lang/cargo/issues/14136 and resolves https://github.com/rust-lang/cargo/issues/6529 This PR implements the use of checksums in cargo fingerprints as an alternative to using mtimes. This is most useful on systems with poor mtime implementations. This has a dependency on https://github.com/rust-lang/rust/pull/126930. It's expected this will increase the time it takes to declare a build to be fresh. Still this loss in performance may be preferable to the issues the ecosystem has had with the use of mtimes for determining freshness.