Is your feature request related to a problem?

Sometimes a type may just be unknown, e.g. when accessing a value of a row. In this case, we currently use Any? as the result. However, it is useful to specifically express this with an unknown type.

Desired solution

Add a new type that is expressed with the keyword unknown. This is already used to express unknown default values.

Possible alternatives (optional)

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Screenshots (optional)

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Additional Context (optional)

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