A most enlightening post, if I may say so, brian_d_foy
I also used to use warn() until I realised that, when re-running Test::* based modules, it [the use of warn()] 'gets in the way' of true warnings - ever since when I, like you, define an additional sub to printf STDERR ... - thus the code behaves as I think it should whilst still generating debugging messages that don't cause test case failures.
A user level that continues to overstate my experience :-))
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