ZPOP: change sync ZPOP to have a count argument instead of N keys.
Usually blocking operations make a lot of sense with multiple keys so that we can listen to multiple queues (or whatever the app models) with a single connection. However in the synchronous case it is more useful to be able to ask for N elements. This is a change that I also wanted to perform soon or later in the blocking list variant, but here it is more natural since there is no reply type difference.
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