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Redisちゃんに愛があった

Redis#exists(key)` will return an Integer in redis-rb 4.3. `exists?` returns a boolean, you should use it instead. To opt-in to the new behavior now you can set Redis.exists_returns_integer = true. To disable this message and keep the current (boolean) behaviour of 'exists' you can set `Redis.exists_returns_integer = false`, but this option will be removed in 5.0. (/app/vendor/bundle/ruby/2.7.0/gems/sidekiq-6.0.7/lib/sidekiq/launcher.rb:160:in `block (2 levels) in ')