PSUBSCRIBE scoping

[smrt28]

Hi,

last week we started using "PSUBSCRIBE" feature in our project. Later I was little surprised by its behavior. All the redis commands have the key space based on db number.

According to my findings and the docs at:

https://redis.io/topics/pubsub

The channels are the only exception. Why? Is there a reason for this? IMO, it's not intuitive and unexpected. We are several developers. Each of us could have just used a different db number not to break each others environment and it always worked until we started witch channels. We have to introduce prefixes to avoid of the exception.

[Jan-Erik Rediger]

Redis' pubsub functionality is completely decoupled from the rest of its operations
(well, except for Keyspace Notifications: https://redis.io/topics/notifications).

That's why it does not follow the usual database separation (since it
does not even belong to any database)

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