2014-11-12 20:53 GMT+01:00 Rick Waldron <[email protected]>: > > Done https://github.com/tc39/agendas/blob/master/2014/11.md >
Thanks. A related point: my harmony-reflect shim also patches Array.prototype.concat such that it recognizes proxies-for-arrays and will splice their elements (rather than adding the proxy as a single element to the target array). In ES6, this may not be necessary since a proxy could implement @@isConcatSpreadable (see < http://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.prototype.concat> step 9.b) However, looking at IsConcatSpreadable < http://people.mozilla.org/~jorendorff/es6-draft.html#sec-isconcatspreadable> step 5, you'll notice it explicitly tests for Arrays. *If* we decide that Array.isArray should return `true` for proxies-for-arrays, *then* I think we should relax this step 5 to also return `true` for proxies-for-arrays, on the grounds of consistency and principle-of-least-surprise. Cheers, Tom
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