Re: [spec-reviews] Review FormData additions in XHR (#87)

It's *almost* orthogonal -- but I'd note there was a change from DOMString to USVString here, and whether it's in line with the guidance on which to use at http://heycam.github.io/webidl/#idl-USVString .  It's possible the guidance (which also isn't particularly clear) needs updating and the change here was correct, but it seems like the sort of thing where we should have clear guidance on when APIs are supposed to use which.  /cc @heycam

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