[investigation] can we support live arrays instead of replicating them

[caridy]

There are two main reasons for the current cloning mechanism for arrays:

• it reduces the risk of poisoning (but does not eliminated complete because of array-like objects are very effective replacement).
• Array.prototype.length, which is not a traditional accessor backed up by an internal slot.

Is is possible to solve this in a way that an array instance crossing the membrane can be proxified and its identity preserved by remapping the prototype of the proxy?