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Add FAQ about instanceof

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Sindre Sorhus 2021-10-31 12:34:45 +07:00
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@ -602,6 +602,10 @@ For the ones I found, pick 3 of these.
The most common mistakes I noticed in these modules was using `instanceof` for type checking, forgetting that functions are objects, and omitting `symbol` as a primitive.
### Why not just use `instanceof` instead of this package?
`instanceof` does not work correctly for all types and it does not work across [realms](https://stackoverflow.com/a/49832343/64949). Examples of realms are iframes, windows, web workers, and the `vm` module in Node.js.
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