A tiny Node.js utility that provides a playful, chainable DSL for asserting that a number is **not** thirteen (or not within certain ranges related to thirteen). It mirrors the API of the “is‑thirteen” library, adding a `.not` operator so developers can write readable checks like `is(12).not.thirteen()` or `is(1).not.within(10).of.thirteen()`. Ideal for JavaScript projects that want a humorous way to validate numbers against the superstition‑laden value 13.
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Check if a number is equal to 13
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