Rust ecosystem uses a slightly modified semver: https://doc.rust-lang.org/cargo/reference/resolver.html#semver-compatibility https://doc.rust-lang.org/cargo/ref

Rust ecosystem uses a slightly modified semver: https://doc.rust-lang.org/cargo/reference/resolver.html#semver-compatibility https://doc.rust-lang.org/cargo/reference/resolver.html#semv... In this scheme, 0.x.y is compatible with 0.x.z, so developing pre-1.0 software is as strict for breaking changes as post-1.0, just the numbers are different. For this very reason, many crates don’t rush into 1.0 territory and are comfortable in pre-1.0 zone.