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Message: [QUOTE="Ola Bini, post: 4528030"] I beg to differ, and according to the pick-axe, this interpretation is correct. Duck-typing isn't to *trust* your callers. Duck typing is to check if something quacks like a duck and walks like a duck. Well, me calling respond_to? checks if the object quacks and walks. What you are describing isn't a technique, it is the absence of a technique. -- Ola Bini ([URL]http://ola-bini.blogspot.com[/URL]) JvYAML, RbYAML, JRuby and Jatha contributor System Developer, Karolinska Institutet ([URL]http://www.ki.se[/URL]) OLogix Consulting ([URL]http://www.ologix.com[/URL]) "Yields falsehood when quined" yields falsehood when quined. [/QUOTE]