How Web Standards Work 1. design a flawed API (it's fine! APIs are hard) 2. ship it in the most-used browser, despite objections 3. get cross-browser working group to fix the API 4. oops, too late, that would break the webpic.twitter.com/IuU6Xxzilv
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If we _really_ cared we could even put Array.prototype on the proto chain (and in fact Gecko did that for some things for a while), but that depends on how we want instanceof to behave.
There are some issues with JSON serialization, etc, but those might be solvable with toJSON methods, maybe. Anyway, as an interim step to a future in which there's a real Array here in some way (but one that prevents "illegal mutations" somehow) this seems totally doable.
I think it would be more real (and a source of fewer pitfalls) than the FrozenArray version. Could even have mutable and immutable variants where index setters for the mutable version need to handle length updating.
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