I'd like to propose adding support for an iteration trap handler for Proxy, fleshing out the list of [currently supported Proxy handlers]( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy#Methods_of_the_handler_object ). I think Proxy is among the most powerful features of JS, so I find it unfortunate iteration, a common operation, is still missing. No new syntax would be required for this addition.
On a side-note, I'd be happy if there were no additional [requirements]( http://stackoverflow.com/a/32360219/1502035) on usage of such a trap, but I'm not sure that would complicate implementation.
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