haxe json circular reference patch

circular.hx

var _data:Dynamic = ...;

var cache:Array<Dynamic> = [];
var jsonString = haxe.Json.stringify(_data, function(key:Dynamic, value:Dynamic) {
  // kill keys you don't want here
  // if(key == "ba") return null;

  // only filter objects
  if(value != null && Reflect.isObject(value)) {
    if(cache.indexOf(value) > -1) {
      return null;
    }

    // store value
    cache.push(value);
  }

  return value;
});

js.Browser.window.console.log(jsonString);