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Robustness principle / postel's law: "_Be conservative in what you produce/output while being liberal in what you accept from others_" [^]{https://en.wikipedia.org/wiki/Robustness_principle}
Postel's law is now considered harmful.
[^]{The Robustness Principle Reconsidered. Eric Allman. doi:10.1145/1978542.1978557  http://cacm.acm.org/magazines/2011/8/114933-the-robustness-principle-reconsidered/fulltext}
[^]{The Harmful Consequences of Postel's Maxim https://tools.ietf.org/html/draft-thomson-postel-was-wrong-00}
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