Under MacRuby 0.6, dumping out a large Hash into a YAML file generates many warning lines of: unknown: warning: instance variable @taguri not initialized A brief web search sees this popping up in ruby 1.8.3, but subsequently fixed (at least 1.8.7 does not emit these msgs) Are there known issues with YAML dumps, especially on large Hashes (under MR, native NSDictionaries passed back from a framework)? -Daniel