ArrayClass should imply @@isConcatSpreadable

Boris Zbarsky bzbarsky at MIT.EDU
Mon Oct 28 16:46:12 PDT 2013

On 10/28/13 7:43 PM, Boris Zbarsky wrote:
>   Our current implementation returns vanilla JS arrays, but returns a
> new one every get, which is pretty suboptimal.  So we were considering
> changing them to some ArrayClass interface and thinking about what
> issues that might cause for callers...

To be clear, we _could_ just change this particular API (Gamepad) to 
returning a plain-vanilla JS array and the same one every time and allow 
the caller to write to it; it's not like the API implementation ever 
_reads_ this array, so there aren't even safety issues here.  That still 
seems like it makes it really easy for a caller to accidentally modify 
the array and cause another caller to see incorrect data here, which 
smells quite fishy to me.


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