OpenBitSet.equals(Object o) bug?

[eks dev]

Yonik, should this not be the other way round, or I missed something? "this" is 
always an instance of OpenBitSet

    if (!(o instanceof OpenBitSet)) return false;
instead of: 

  public boolean equals(Object o) {
...
    if (!(this instanceof OpenBitSet)) return false;
...