WeakMap vs Array::indexOf on deduplication

result.txt

uniqMap: 25ms
uniqOld: 337ms
--
on Firefox 7.01

weakmap_uniq_bench.co

function uniqMap array
  map = new WeakMap
  dic = Object.create null
  for item of array
    type = typeof item
    if item and type of <[ object function ]>
      continue if map.has item
      map.set item
    else
      continue if dic[key = item + type]
      dic[key] = 1
    item

function uniqOld array
  results = []
  results.push item if 0 > results.indexOf item for item of array
  results

uniques = [true false]
uniques.push C i for i to 99 for C of [Object, Array, RegExp, Number, String]
duplicates = [...uniques] * 99

for uniq of [uniqMap, uniqOld]
  start   = Date.now!
  results = uniq duplicates
  console.log "#{uniq.name}: #{ Date.now! - start }ms"
  console.error uniques, results unless uneval(uniques) is uneval(results)

weakmap_uniq_bench.js

var uniques, C, i, duplicates, uniq, start, results, _i, _ref, _len, __slice = [].slice;
function uniqMap(array){
  var map, dic, item, type, key, _i, _len, _results = [];
  map = new WeakMap;
  dic = Object.create(null);
  for (_i = 0, _len = array.length; _i < _len; ++_i) {
    item = array[_i];
    type = typeof item;
    if (item && (type === 'object' || type === 'function')) {
      if (map.has(item)) {
        continue;
      }
      map.set(item);
    } else {
      if (dic[key = item + type]) {
        continue;
      }
      dic[key] = 1;
    }
    _results.push(item);
  }
  return _results;
}
function uniqOld(array){
  var results, item, _i, _len;
  results = [];
  for (_i = 0, _len = array.length; _i < _len; ++_i) {
    item = array[_i];
    if (0 > results.indexOf(item)) {
      results.push(item);
    }
  }
  return results;
}
uniques = [true, false];
for (_i = 0, _len = (_ref = [Object, Array, RegExp, Number, String]).length; _i < _len; ++_i) {
  C = _ref[_i];
  for (i = 0; i <= 99; ++i) {
    uniques.push(C(i));
  }
}
duplicates = __repeatArray(__slice.call(uniques), 99);
for (_i = 0, _len = (_ref = [uniqMap, uniqOld]).length; _i < _len; ++_i) {
  uniq = _ref[_i];
  start = Date.now();
  results = uniq(duplicates);
  console.log(uniq.name + ": " + (Date.now() - start) + "ms");
  if (uneval(uniques) !== uneval(results)) {
    console.error(uniques, results);
  }
}
function __repeatArray(arr, n){
  for (var r = []; n > 0; (n >>= 1) && (arr = arr.concat(arr)))
    if (n & 1) r.push.apply(r, arr);
  return r;
}