Sourced from redis's changelog.

5.0.5

• Fix automatic disconnection when the process was forked. See #1157.

5.0.4

• Cast ttl argument to integer in expire, setex and a few others.

5.0.3

• Add OutOfMemoryError as a subclass of CommandError

5.0.2

• Fix Redis#close to properly reset the fork protection check.

5.0.1

• Added a fake Redis::Connections.drivers method to be compatible with older sidekiq versions.

5.0.0

• Eagerly and strictly cast Integer and Float parameters.
• Allow to call subscribe, unsubscribe, psubscribe and punsubscribe from a subscribed client. See #1131.
• Use MD5 for hashing server nodes in Redis::Distributed. This should improve keys distribution among servers. See #1089.
• Changed sadd and srem to now always return an Integer.
• Added sadd? and srem? which always return a Boolean.
• Added support for IDLE paramter in xpending.
• Cluster support has been moved to a redis-clustering companion gem.
• select no longer record the current database. If the client has to reconnect after select was used, it will reconnect to the original database.
• Better support Float timeout in blocking commands. See #977.
• Removed positional timeout in blocking commands (BLPOP, etc). Timeout now must be passed as an option: r.blpop("key", timeout: 2.5)
• Removed logger option.
• Removed reconnect_delay_max and reconnect_delay, you can pass precise sleep durations to reconnect_attempts instead.
• Require Ruby 2.5+.
• Removed the deprecated queue and commit methods. Use pipelined instead.
• Removed the deprecated Redis::Future#==.
• Removed the deprecated pipelined and multi signature. Commands now MUST be called on the block argument, not the original redis instance.
• Removed Redis.current. You shouldn't assume there is a single global Redis connection, use a connection pool instead, and libaries using Redis should accept a Redis instance (or connection pool) as a config. E.g. MyLibrary.redis = Redis.new(...).
• Removed the synchrony driver.
• Removed Redis.exists_returns_integer, it's now always enabled.

4.8.0

• Introduce sadd? and srem? as boolean returning versions of sadd and srem.
• Deprecate sadd and srem returning a boolean when called with a single argument. To enable the redis 5.0 behavior you can set Redis.sadd_returns_boolean = false.
• Deprecate passing timeout as a positional argument in blocking commands (brpop, blop, etc).

... (truncated)

• f3d886f Release 5.0.5
• bdd51c9 Bump redis-cluster-client
• 9429205 Merge pull request #1158 from casperisfine/fork-handling
• 389d8b6 Fix automatic disconnection when the process was forked
• fdf61e5 Merge pull request #1156 from roharon/hash_flatten_performance
• 525e5c4 Modify: improve performance of hash flatten without to_a method
• 912c008 Merge pull request #1155 from dentarg/patch-1
• 371d8c1 Fix Ruby syntax in example in README
• 07cccee Merge pull request #1153 from supercaracal/fix-cluster-test
• d6cf651 Shrink cluster test cases guaranteed by redis-cluster-client and focus on beh...
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