I think more languages should have `unless`. I have seen lots of code like `if !(this || that)` that would be easier to read with `unless`. Sometimes `if !this && !this` is clear enough but I frequently find that I am decided between two mediocre options. I think the clarity of `unless`outweighs the benefit of another keyword, especially when it is so similar to `if`.

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@kevincox switch / case / default pattern, and discrete tests for 'this' and 'that' ending with else or explicit goto, make a natural place for the code to flow to if none already matched.

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