whole_func_string: function _stripKeysWithUndefinedValues(dictionary) {
    for (let k in dictionary) {
      if (dictionary[k] === undefined) {
        delete dictionary[k];
      }
    }
    return dictionary;
  }
func_code_string: function _stripKeysWithUndefinedValues(dictionary) {
    for (let k in dictionary) {
      if (dictionary[k] === undefined) {
        delete dictionary[k];
      }
    }
    return dictionary;
  }
func_documentation_string: //////////////////////////////////////////////////////////////////////////// 
  destructive -- mutates, returns reference only for convenience