An array destructing specification choice

[Till Schneidereit]

> I.e., I think the most easily comprehensible behavior is to make array
> destructuring treat the RHS as an Array.
> It matches the common use-case (actual arrays), it is consistent (does
> the same whether you use ... or not), and is easily explainable.

I agree with the consistency argument. The reason I'm in favor of [no,
no] is that otherwise
[x,y,z] = {0:0, 1:1, 2:2}
would result in
x=undefined,y=undefined,z=undefined

That doesn't seem desirable to me.