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Singleinflight interferes with the health checking of upstream. If an upstream would fail, singleinflight would mirror that error to to other proxy *iff* multple identical queries would be inflight. This would lead to marking *all* upstreams as bad, essentially collapsing multiple upstreams into a SPOF. Clearly not what we want. Singleinflight does have some nice properties, but I've opted to rip it out entirely. Caching should almost (but not quite) as good. Added a test case in test that uses 3 CoreDNS instances to reflect the setup from #715. Found another bug as well, where (when the policy would be nil), we would always Spray even though we've found a healthy host.