RUBY-2480 Define bson_type on caching hash (#2510)
RUBY-2480 Define bson_type on caching hash (#2510)

Co-authored-by: Oleg Pudeyev <e6fb06210fafc02fd7479ddbed2d042cc3a5155e@olegp.name>
mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver