This is Postel's Law, aka the Principle of Robustness: "be conservative in what you send, be liberal in what you accept" https://en.wikipedia.org/wiki/Rob

This is Postel's Law, aka the Principle of Robustness: "be conservative in what you send, be liberal in what you accept" https://en.wikipedia.org/wiki/Robustness_principle https://en.wikipedia.org/wiki/Robustness_principle