Unlike write_concern and read_preference, I cannot set read_concern for individual operations like mongocxx::options::find, mongocxx::options::update & co. It would make sense for read_concern to be supported in all the same contexts as write_concern + matching read operations.
- related to
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CXX-1749 mongocxx api doc: read_concern can also be set in transaction options
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- Backlog
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