I wasn't looking for a bug,I was auditing one of the foundational primitives in my infrastructure. The implementation was compact, the test coverage was solid, and nothing immediately stood out. Then one small constraint caught my attention. It had nothing to do with Rust's type system or memory safety, The primitive was rejecting a mathematically valid value without violating a single structural invariant,The rejection existed for one reason only: I had decided the value wasn't meaningful. ...