text: -- minItems validation
  -- longer is valid
  SELECT is_jsonb_valid('{"minItems":1}', '[1,2]');
  -- exact length is valid
  SELECT is_jsonb_valid('{"minItems":1}', '[1]');
  -- too short is invalid
  SELECT is_jsonb_valid('{"minItems":1}', '[]');
  -- ignores non-arrays
  SELECT is_jsonb_valid('{"minItems":1}', '""');