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Why does it have to be that the order of members matters? shouldn't both {x,y,z} and {z,x,y} compile down to {x,y,z}?

In JS for-in loop enumerates keys in the insert order. So {x,y,z} is different from {z,x,y}

AFAIK, that's not true; the spec doesn't guarantee that it iterates in insertion order, it's just how it's commonly implemented in browsers.

I think they added this with ES2015.