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antirez authored
Using the is_key_ready() callback plus the reply callback later, creates different issues AFAIK: 1. More complex API. 2. We need to call the reply callback() ASAP if the is_key_ready() interface returned success, however the internals do not work in that way, so when the reply callback is called the setup could be different. To fix that, there is to break the current design that handles the unblocked clients asyncrhonously, and run the list ASAP.
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