Comment by A1kmm
I think it's Jon Postel who was the original source of the principle (it's often called Postel's Law). https://www.rfc-editor.org/rfc/rfc761#section-2.10 is an example dating back to 1980.
I think it's Jon Postel who was the original source of the principle (it's often called Postel's Law). https://www.rfc-editor.org/rfc/rfc761#section-2.10 is an example dating back to 1980.