>I have never seen that. 20 years in the game. I have seen that a bit too many times, it's pretty terrible. People debug and print HashMap contents, and compla

>I have never seen that. 20 years in the game. I have seen that a bit too many times, it's pretty terrible. People debug and print HashMap contents, and complain the thing is broken... as get(Object) just returns null, finding an empty bucket. I guess, you have been a bit more lucky than I was. Definitely seen too many mutable keys.