[FileAPI] Constructing a new blob from a closed blob (#17)

Currently it seems that the spec allows to create a new blob starting from a closed one:

var a = new Blob([42]);
a.close();
var b = new Blob([a]);

This seems wrong to me because a.size is 0 and that blob cannot be read in any way.
I would suggest to throw an exception.

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/FileAPI/issues/17