Re: [fetch] Automatically set request's "Content-Type" to "application/json" for POJOs (#47)

It's hard (if not impossible) to distinguish plain-ol'-JS-objects from objects we want to do something with. I guess in theory we could have this as the fallback rather than stringifying. @nikhilm @bzbarsky, thoughts? It would complicate the implementation a lot as we could no longer use types, we'd have to use `any` unless IDL gains support for this kind of thing.

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