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Replaces dead external link with archived version. #2808

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Expand Up @@ -12,7 +12,7 @@ The [`strictFunctionTypes`](/tsconfig#strictFunctionTypes) switch is part of the
You can opt-out by setting `--strictFunctionTypes false` on your command line or in your tsconfig.json.

Under [`strictFunctionTypes`](/tsconfig#strictFunctionTypes) function type parameter positions are checked _contravariantly_ instead of _bivariantly_.
For some background on what variance means for function types check out [What are covariance and contravariance?](https://www.stephanboyer.com/post/132/what-are-covariance-and-contravariance).
For some background on what variance means for function types check out [What are covariance and contravariance?](https://archive.md/B1xWu).

The stricter checking applies to all function types, _except_ those originating in method or constructor declarations.
Methods are excluded specifically to ensure generic classes and interfaces (such as `Array<T>`) continue to mostly relate covariantly.
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