[web-audio-api] Specify the data model for AudioParam.setValueCurveAtTime (#67)

> Originally reported on W3C Bugzilla [ISSUE-22831](https://www.w3.org/Bugs/Public/show_bug.cgi?id=22831) Mon, 29 Jul 2013 18:49:41 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

We need to specify exactly what happens when you call AudioParam.setValueCurveAtTime.  Roc's proposal was that we should copy the arrays passed into this method when it gets called and use the internal copies from that point on so that we don't race with those arrays being modified on the main thread.  I support that proposal.

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https://github.com/WebAudio/web-audio-api/issues/67