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I'm also a big fan of not using magic numbers. Even in a "simple one-liner".
You're removing those numbers from the input, so, when the control function calculates its sum, it's using the other numbers:
136 + 128 + 83 = 347Anyways, I've changed the tests so the expected value is computed first and your code messing with the input isn't a problem anymore, but be aware of that.Don't mutate the input.
In bigger projects i would expect such constants. That is much better, than 'magic' 0.5. But if we want just simple function... =)