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As far as I know, there is no official Minimum Safe Rust Version (MSRV) policy for this crate, which makes it difficult to include it in crates that do have an MSRV policy. After some testing and adjustment, I've found that the MSRV for this crate is 1.38.0. If you disable some features, it's probably lower, but I think a two-year old version of Rustc is conservative enough. This pull request adds an MSRV policy, as well as a test in the CI to make sure that the crate builds on the MSRV.