docs: @JRubyMethod(name = "<=>")
      public static IRubyObject cmp(IRubyObject alias1, IRubyObject alias2) {
          IRubyObject str1 = (IRubyObject)((RubyObject)alias1).fastGetInstanceVariable("@name");
          IRubyObject str2 = (IRubyObject)((RubyObject)alias2).fastGetInstanceVariable("@name");
          return str1.callMethod(alias1.getRuntime().getCurrentContext(), "<=>", str2);
      }