Re: [w3c/FileAPI] Make the FileList interface iterable (#94)

Ok, thank you; I think I get it now.

I thought "indexed property getter" meant something about the object itself, as if you could make a custom object that has an "indexed property getter". But actually, it means a spec basically notes that that a particular getter method on a particular standard web platform object is the way to access the index properties, and therefore that object is implicitly iterable. In the case of `FileList`, the [`FileList` instance method `item`](https://w3c.github.io/FileAPI/#dfn-item) is specially identified in the spec as the indexed property getter that makes `FileList` implicitly iterable.

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