text: -- uniqueItems validation
  -- unique array of integers is valid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[1,2]');
  -- non-unique array of integers is invalid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[1,1]');
  -- numbers are unique if mathematically unequal
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[1,1,1]');
  -- unique array of objects is valid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{"foo":"bar"},{"foo":"baz"}]');
  -- non-unique array of objects is invalid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{"foo":"bar"},{"foo":"bar"}]');
  -- unique array of nested objects is valid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{"foo":{"bar":{"baz":true}}},{"foo":{"bar":{"baz":false}}}]');
  -- non-unique array of nested objects is invalid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{"foo":{"bar":{"baz":true}}},{"foo":{"bar":{"baz":true}}}]');
  -- unique array of arrays is valid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[["foo"],["bar"]]');
  -- non-unique array of arrays is invalid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[["foo"],["foo"]]');
  -- 1 and true are unique
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[1,true]');
  -- 0 and false are unique
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[0,false]');
  -- unique heterogeneous types are valid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{},[1],true,null,1]');
  -- non-unique heterogeneous types are invalid
  SELECT is_jsonb_valid('{"uniqueItems":true}', '[{},[1],true,null,{},1]');