mbien commented on issue #9270:
URL: https://github.com/apache/netbeans/issues/9270#issuecomment-4063960407

   >>    Wondering why you expect it to work if the instance identity changes?
   >
   > Because it's not written anywhere.
   
   We certainly can add a note to the javadoc, but please be aware that Maps 
and Sets are used everywhere (not just in NB).
   
   Mutable hash code is a red flag and will fail in many situations. By 
default, virtually everything will expect it to be constant. (e.g I remember 
https://issues.apache.org/jira/browse/LUCENE-10431 and how tricky it was narrow 
down)


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