In implementing this I realized that all the possible ways to do what the spec tentatively says to do introduce a unique new ability or mechanic.
1.) A new function that has the same object identity and is a mirror, but has a differently set internal property. 2.) A mirror with a separate object identity but is otherwise the same and updates in real time. 3.) A shallow copy, which introduces a unique way to clone the internals of a function and get a new copy that can then diverge.
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