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9c3d25e178
Commit f4fb45d15c contained a bug in removing items with null values when
unique keys are required, where the leading items that are sorted
contained such values. Fix that and add a test for it.
Discussion: https://postgr.es/m/CAJA4AWQ_XbSmsNbW226UqNyRLJ+wb=iQkQMj77cQyoNkqtf=2Q@mail.gmail.com