From: Yukihiro Matsumoto Date: 2010-01-23T04:25:21+09:00 Subject: [ruby-core:27708] Re: [Feature #2619] Proposed method: Process.fork_supported? Hi, In message "Re: [ruby-core:27684] Re: [Feature #2619] Proposed method: Process.fork_supported?" on Fri, 22 Jan 2010 17:27:45 +0900, Charles Oliver Nutter writes: |Except that as Akira pointed out, even on the C impl you can't know |whether the system itself has stubbed out certain functionality and |won't actually provide it. So everyone that expects respond_to? in |1.9+ to produce a definitive result will still be mistaken. What have |we gained? As far as I understand, he only said there are some cases whether the availability of a feature can only be known at runtime, not impossible to implement 1.9 behavior. So I want to make your opinion clear. You don't like the implementation complexity to implement 1.9 respond_to? behavior, or something else? matz.