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Thanks to SERVER-28943 shards now retry non-write commands on stale exception.
This is done unconditionally even if the exception is indicating that the router was stale.
Once database and collection version will be truly comparable (SERVER-52587) we can conditionally refresh and retry the command only if "requiredVersion (Router) > wantedVersion (Shard)".
This new behavior should be either addressed once 5.0 becomes last-lts or should be guarded by an FCV flag in order to be sure that we are on a binary version that uses truly comparable database and collection versions.
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