The most reported bug in JavaScript
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Apparently, 0.1 + 0.2 does not equal 0.3, and this is “the most reported bug in JavaScript”. (I’m pretty sure the most reported bug in JavaScript is “help, this language is bullshit”).
— You Owe Me An Apology Despite Never Having Met Me, on JavaScript: The Good Parts
(Despite this making me laugh, I do recommend the book. It is excellent.)