Re: [w3c/FileAPI] Implementations allow all values in type getter (#43)

What I want is that a `Blob` holds a MIME type in an internal slot and `type` returns that serialized. And to be clear, that MIME type can have parameters as well, otherwise there's severe issues for `multipart/*` (needs `boundary`) and most MIME types that need `charset`. 

And then on the input side, if a MIME type cannot be parsed out of the input, we use `application/octet-stream` or some such as replacement.

I'm willing to write all the tests for this if we can agree on this model.

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