redis-rb
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Fix reutrning in subscription callbacks cause race condition
This PR fixes #1065
Could you produce a test case for this? It's really a fairly sensitive thing, so I'm not really willing to change this without proper test coverage on it.
Thank you for reviewing! I'll add tests for this PR when I have time. could you please wait for it?
I wrote a test, but I'm not sure it is enough. Please teach me if there are other test cases that we should cover.
Closing as stale. The bug should be solved in 5.x already.