[heycam/webidl] [[Set]] algorithm for legacy platform objects does not seem to be compatible with the Storage interface (#366)

By my reading of the [[Set]] algorithm for legacy platform objects (https://heycam.github.io/webidl/#legacy-platform-object-set), it seems to state that an interface that doesn't support indexed properties, but does support named properties, will not allow setting indexed properties (by way of conversion to DOMString). (See step 1.2).

At the same time, the Storage interface (https://html.spec.whatwg.org/multipage/webstorage.html#the-storage-interface) only supports named properties, so as per my understanding, something like:

`window.localStorate[7] = "foo";`

should not be allowed. But, browsers (I tested Safari and Firefox) do allow this.

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