New releases of tracked Rust crate packages (serde, tokio, clap, reqwest, and more) on crates.io (Rust) since a timestamp — each tagged new_release or breaking_change (major-version bump) with a 1-10 significance score. Answers "did a dependency in my Cargo.toml ship a new or breaking version I should pin or upgrade?" Pass ?package=<name> for ANY Rust crate package on demand.

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