message: One more requested test
diff: @@ -296,9 +296,12 @@ mod test {
  assert_eq!(namespace_upper_bound(b"bob"), b"boc".to_vec());
  assert_eq!(namespace_upper_bound(b"fo\xfe"), b"fo\xff".to_vec());
  assert_eq!(namespace_upper_bound(b"fo\xff"), b"fp\x00".to_vec());
  + // multiple \xff roll over
  assert_eq!(
  namespace_upper_bound(b"fo\xff\xff\xff"),
  b"fp\x00\x00\x00".to_vec()
  );
  + // \xff not at the end are ignored
  + assert_eq!(namespace_upper_bound(b"\xffabc"), b"\xffabd".to_vec());
  }
  }
  