deliver vs hit_for_pass with ttl of 0

[James Pearson]

There are some instances where we know in vcl_fetch that we don't want to cache
an object, but we also don't want to cache the no-cache decision (that is, the
next request should be sent to the backend).  We're doing that by setting
`beresp.ttl = 0s`, which works fine.

What I'm wondering is as to whether it's better to return `deliver` or
`hit_for_pass`, or if it really makes any difference at all.  Both should be
immediately removed from their respective caches, right?

 - James
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