rem: return destination; 
add:  element._extended = true; return element; 
context: Object.extend = function(destination, source) {  for (property in source) {    destination[property] = source[property];  }  return destination;}
meta: 2019	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2019/cb20644c026e010b58d134c622b7dd70eddae16a/prototype.js/buggy/phpmyfaq/inc/js/prototype.js