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Currently, Blob.close() is specified to throw an error on read methods, but the Blob model doesn't mention a potentially closed state, and how that might be processed, including on Blob URLs. This bug is to: 1. Include Blob.close in the model for the File API, such as a "closed state." 2. Tie Blob.close with read methods based on model. 3. Determine what happens to closed Blobs as Blob URLs. The model favors treating "closed state" blobs as having no bytes.
Done. http://dev.w3.org/2006/webapi/FileAPI/#close-method