Use an Arc to share stub resolver #393
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This somewhat simplifies usage for call sites. They no longer need to use `&&StubResolver` for some APIs, and a future can be handed off without being tied to the lifetime of the resolver. The documentation already mentioned that the StubResolver was behind an Arc so I did not need to updated it. StubResolver now implements clone, which is cheap since it merely clones the Arc with the inner data. This change is backwards-incompatible, and necessitates a bump in minor for the next unstable release. Fixes: NLnetLabs#175
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This somewhat simplifies usage for call sites. They no longer need to use
&&StubResolverfor some APIs, and a future can be handed off without being tied to the lifetime of the resolver.The documentation already mentioned that the StubResolver was behind an Arc so I did not need to updated it. StubResolver now implements clone, which is cheap since it merely clones the Arc with the inner data.
This change is backwards-incompatible, and necessitates a bump in minor for the next unstable release.
Fixes: #175