anchor.diff:  
     _childOfItemByKey(item, key) {
       return (item is Iterable)
  -    ? item[int.parse(key)]
  -    : item[key];
  +        ? item[int.parse(key)]
  +        : item[key];
     }
   
     String toString() {
  
positive.code:     if (value is Map) return _replaceEnvInMap(value);
      var matcher = new RegExp(r'^env\(\s*(.*?)\s*(?:,\s*(.*?))?\s*\)$');
      if (value is! String || !matcher.hasMatch(value)) return value;
      return (value as String).replaceFirstMapped(matcher, (m) {
        var envName = m[1];
        var defaultValue = m[2];
        return _cast(env(envName, defaultValue));
      });
    }
  
    Object _cast(String env) {
  
negative.code:   static _loadEnv() {
      try {
        dotenv.load();
      } on FileSystemException {}
      _envHasBeenLoaded = true;
    }
  
  