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I’d recommend reading this if you are interested in why making assumptions when designing a system is a bad idea (but often necessary): https://github.com/kdeldycke/awesome-falsehood
Especially the one on names: https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/ And the one on time: http://infiniteundo.com/post/25326999628/falsehoods-programmers-believe-about-time