matthiasblaesing commented on issue #9270:
URL: https://github.com/apache/netbeans/issues/9270#issuecomment-4069901138

   > If we add documentation, I would probably document in `Lookup` that 
mutable objects with changing hash code or equals should not be included in 
them? I think we have multiple other places that could be affected by similar 
issues.
   
   I would not change `Lookup`. That interface only covers the "read" side. And 
that is not affected by this. The crucial part is the lookup creator needs to 
define whether it will store identity-shifting objects or not. So I think 
`AbstractLookup` is the right place as that is the class that a caller needs to 
instantiate differently and has direct control over.


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