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File.directory? should handle IO's #471
I don't think we'll be fixing JRUBY-4033 anytime soon. I mean, we could use jnr-enxio to open directories as files, but then we'll be introducing a whole new boatload of potential compatibility problems.
More than I'd like to do in a point release anyway, but maybe we'll do it for JRuby-9k-BFG-Edition.