Missleading revert message

[clauBv23]

Hi there,
Thanks for such an amazing tool.

I have a simple test that validates upgrade and it was reverting with the message

[FAIL: revert: Failed to run upgrade safety validation: Warning: Potentially unsafe deployment of src/Contracy.sol:Contract

    You are using the `unsafeAllow.delegatecall` flag.

] 

while this shouldn’t be an error at all.

Printing result.stdout value on the _validate function I was able to find the real problem

   ✘  src/Contract.sol:Contract (upgrades from ...)

      src/Contract.sol:880: Upgraded `__gap` to an incompatible type
        - Bad storage gap resize from 50 to 43
          Size decrease must match with corresponding variable inserts
        > Set __gap array to size 44

Not sure how result is being parsed but looks like the information on result.stderr can be misleading, while the one in result.stdout seems to be more accurate.