code: function buildObjectInstanceMethods(set, target) {
      extendSimilar(target, true, false, set, function(methods, name) {
        methods[name + (name === 'equal' ? 's' : '')] = function() {
          return object[name].apply(null, [this].concat(multiArgs(arguments)));
        }
      });
    }
docs: Object class methods implemented as instance methods