Gonçalo Fernandes comments

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                                            Gonçalo Fernandes

Generic inference to unknown after using function arguments

This issue might be related: [38264](https://github.com/microsoft/TypeScript/issues/38264).

Allow non returning functions to have contextually required `undefined` return type

Consider ReactJS's `useEffect`, the first argument must be a function that returns `void | (() => void | undefined)`. The problem is the following is valid: ```ts const f: ()...