ecki commented on issue #111: [IO-661] FileUtils throws inconsistent exceptions URL: https://github.com/apache/commons-io/pull/111#issuecomment-616210164 Generally I would agree with IAE for Argument checking however in the specific case an external condition (directory deleted or replaced by file) can cause the check to fail. Also the check methods hide IO exceptions so they can be intermittent. For this case I would prefer a change and think there should be no compatibility impact.
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