Caret, tilde and other loose requirements are fine in Cargo.toml because cargo generates Cargo.lock on your behalf with the exact versions required for your bu

Caret, tilde and other loose requirements are fine in Cargo.toml because cargo generates Cargo.lock on your behalf with the exact versions required for your build. This is how pretty much all modern dependency managers work(Bundler, Composer, NPM, CocoaPods, SPM, etc). Saying that this doesn't work just is not true.