Check key type first in blocking functions #1130
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Whenever Redis gets a blocking pop command, it tries to pop the value first, and if the value is of the wrong type, it aborts with a WRONGTYPE error. Note that setting the key with the wrong type afterwards (while the timeout is on), will not emit a WRONGTYPE error.
This is arguably in 'bug compatible' category - but blocking when the client may not expect it is best avoided.