rem: return $H(hash).inject($H(this), function(mergedHash, pair) { mergedHash[pair.key] = pair.value; return mergedHash; 
add: return this.select(function(value) { return !values.include(value); 
context:     return $H(hash).inject($H(this), function(mergedHash, pair) {      mergedHash[pair.key] = pair.value;      return mergedHash;    });
meta: 5150	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5150/44d85be227cc8496144d82df38b82dfcc1224861/prototype.js/clean/intermine/webapp/main/resources/main/js/prototype.js