Simple array literals in V8 have the nice property that they're 
copy-on-write. That's not the case for object literals, but I take from this 
comment 
<https://github.com/v8/v8/blob/ab46151aea9364db315e3a61ae63e98cd1286b4f/src/code-stubs.cc#L3944>
 that 
it's at least been considered. Is this an optimization that's likely to 
come? Or are there issues with the implementation that have discouraged it? 
Thanks!

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