Re: [heycam/webidl] Do records (record<>s) purposefully throw on any object with an enumerable Symbol-named property? (#294)

I didn't consider the case of Symbol-named properties. The existing implementation in Mozilla is a good argument to allow-and-ignore Symbol-named properties. On the other hand, we meant folks to create the ES object specifically to pass into the `record<>` argument (evidence: we [didn't search the prototype chain](https://github.com/heycam/webidl/pull/180#issuecomment-252851974)), and accidental Symbols are unlikely in that case, which argues for diagnosing them.

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