garydgregory commented on PR #450:
URL: https://github.com/apache/commons-cli/pull/450#issuecomment-6469896674

   Hello @oscerd 
   
   This PR can break existing applications by throwing 
`IllegalArgumentException` when no exception is currently thrown.
   
   Is this intentional? Whether it is or not , this needs to be documented and 
tested. 
   
   Rebase on git master and see 
`DefaultParserTest.testPropertiesPreserveExistingOptionValue()`.
   
   TY!


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