Re: [w3c/FileAPI] Consider reserializing type attributes, not just parsing them. (#123)

Aside from `Blob`, this also affects `slice()` and `File`.

I think what should happen is that we store a MIME type internally (I think @mkruisselbrink was planning on adding internal slots) and the `type` getter serializes it using https://mimesniff.spec.whatwg.org/#serialize-a-mime-type.

I looked into writing a patch for this briefly, but it would end up being quite the rewrite as these bits of the specification are quite dated.

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