[MacRuby-devel] rubyfying Cocoa iterators

I have this ordered Core Data to-many relation named "operations" that I want to iterate over. I wrote: self.operations.each { | operation | operation.doSomething } However this fails because self.operations returns an NSOrderedSet and NSOrderedSet doesn't have an 'each' method. I was able to use the 'enumerateObjectsUsingBlock' method of NSOrderedSet which is working fine. My question is: what would be the MacRuby way to add an 'each' method to NSOrderedSet? Thanks, Jean-Denis