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http://dev.w3.org/2006/webapi/FileAPI/#dfn-Blob "If a type that is not one of DOMString [WebIDL], ArrayBuffer [TypedArrays], or Blob is used as a blobParts member, the user agent MUST throw an InvalidStateError." I think this requirement should be struck. WebIDL should take care of it (it converts to DOMString).
Marking this fixed.