my blog https://overreacted.io
nit
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public/beyond-booleans/index.md
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public/beyond-booleans/index.md
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What does that mean in practice?
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Suppose that you [wanted to](https://stackoverflow.com/questions/39540156/typescript-number-must-be-less-than-1-and-greater-than-0) write a function that takes a number strictly between `0` and `1`. In TypeScript, you can't do much better than throwing a runtime error:
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Suppose that you [wanted to](https://stackoverflow.com/questions/39540156/typescript-number-must-be-less-than-1-and-greater-than-0) write a function that takes a number strictly between `0` and `1`. In TypeScript, you can't do [much](https://gist.github.com/gaearon/966446d27de88ba4d4806a9a5b291d0a) better than throwing a runtime error:
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```js
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function someFunction(x: number) {