whole_func_string: function isError(value) {
  	  switch (Object.prototype.toString.call(value)) {
  	    case '[object Error]':
  	      return true;
  
  	    case '[object Exception]':
  	      return true;
  
  	    case '[object DOMException]':
  	      return true;
  
  	    default:
  	      return value instanceof Error;
  	  }
  	}
func_code_string: function isError(value) {
  	  switch (Object.prototype.toString.call(value)) {
  	    case '[object Error]':
  	      return true;
  
  	    case '[object Exception]':
  	      return true;
  
  	    case '[object DOMException]':
  	      return true;
  
  	    default:
  	      return value instanceof Error;
  	  }
  	}
func_documentation_string: Yanked from https://git.io/vS8DV re-used under CC0 with some tiny modifications