Re: [fetch] Allow operation to outlive the document unloading (beacon) (#124)

> There's one more related feature that I'm interested in: avoiding waking up mobile radio (as far as I understand mobile devices can switch their radio to a low power state when it's not in active use, and any network activity causes radio to switch back to a high-power mode, which quite expensive battery-wise).

FWIW, this is within scope of Beacon -- this is why we introduced Beacon-Age. That said, afaik none of the existing implementations have implemented any logic to take advantage of this... yet. 

/cc @toddreifsteck

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