replication_slots usability issue

-Hackers,

Working on 9.6 today (unsure if fixed in newer versions). Had an issue where the wal was 280G despite max_wal_size being 8G. Found out there were stale replication slots from a recent base backup. I went to drop the replication slots and found that since the wal_level was set to minimal vs replica or higher, I couldn't drop the replication slot. Clearly that makes sense for creating a replication slot but it seems like an artificial limitation for dropping them.

JD

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