This screams 'wisdom earned from painful experience'. Great Tumblr linked in the thread, too.
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Replying to @_rsc and @halvarflake
Also, most common failure mode is “accidentally“ quadratic. Not a double for loop, but something that could be O(1) or O(lg n) but is a simple O(n) (expecting small n) and is then called in a loop from other code with large n. A bad assumption is harder to test than bad code.
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