whole_func_string: function scriptById(scriptId) {
    var scripts = Debug.scripts();
    for (var script of scripts) {
      if (script.id == scriptId) return script;
    }
    return UNDEFINED;
  }
func_code_string: function scriptById(scriptId) {
    var scripts = Debug.scripts();
    for (var script of scripts) {
      if (script.id == scriptId) return script;
    }
    return UNDEFINED;
  }
func_documentation_string: Get a specific script currently loaded. This is based on scanning the heap. TODO(clemensh): Create a runtime function for this.