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Re:Tokio 1.0 – async runtime for Rust by steveklabnik on Friday December 25, 2020 @10:54AM (#25537119)
To be clear, the default semantics are ^, not =. So even if you put 1.2.3 in your Cargo.toml, you may get 1.3.0, you just won’t get 2.0.0.
Re:Tokio 1.0 – async runtime for Rust by pjmlp on Saturday December 26, 2020 @08:18AM (#25543267)
Which might lead to the same outcome anyway as there is nothing that prevents those version numbers to actually mean anything.

It is up to the library authors to uphold its semantics.