Array.isArray(new Proxy([], {})) should be false (Bug 1096753)

[Kevin Smith]

>
> This is really interesting. It does argue for some kind of redefinition of
> Array.isArray to return "is this an instance of some %ArrayPrototype% in
> some realm?"
>

Yeah, my guess would be that if (Array.isArray(obj) === true), then the
user will infer that one or both of the following is true:

- It behaves as if it were created with an array literal (including the
length invariant and Array.prototype methods).
- It should be "rendered" (via JSON or console output) as if it were
created with an array literal.
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