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Examples of binary choices where both options seem equally good at first, but really aren't:
When writing parsers using #parser #combinators, consuming trailing whitespace is better than consuming leading whitespace. "Design patterns for parser combinators" https://dl.acm.org/doi/abs/10.1145/3471874.3472984
When writing #E2E #tests, clearing the database before each test is better than clearing it after. "Dangling state is your friend" https://docs.cypress.io/guides/references/best-practices#Dangling-state-is-your-friend