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The PropUtils.stringConvert method seems to do some kind of magic and is likely to be extended and improved in future, please help definition of its contract and write a test that checks whether it correctly does what it should do.
StringConvert removed - relic of early implementation, nothing was using it.
The method is gone. Btw. could not you remove the PropUtils class from API completely? It seems to contain a lot of package private support and just two (?) public methods. Are they really needed? Or could there be another suitable place for them?