docs: @JRubyMethod(name = "style=")
      public static IRubyObject style_set(IRubyObject self, IRubyObject style) {
          YAMLExtra x = ((Node)self).x;
          Ruby runtime = self.getRuntime();
          Data.Str ds = (Data.Str)((org.yecht.Node)self.dataGetStructChecked()).data;
          if(style.isNil()) {
              ds.style = ScalarStyle.None;
          } else if(style == x.quote1) {
              ds.style = ScalarStyle.OneQuote;
          } else if(style == x.quote2) {
              ds.style = ScalarStyle.TwoQuote;
          } else if(style == x.fold) {
              ds.style = ScalarStyle.Fold;
          } else if(style == x.literal) {
              ds.style = ScalarStyle.Literal;
          } else if(style == x.plain) {
              ds.style = ScalarStyle.Plain;
          }
          ((RubyObject)self).fastSetInstanceVariable("@style", style);
          return self;
      }