/**
   * Gets the index at which the first occurrence of `value` is found in `array`
   * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
   * for equality comparisons. If `fromIndex` is negative, it's used as the
   * offset from the end of `array`.
   *
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} [fromIndex=0] The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   * @example
   *
   * util.indexOf([1, 2, 1, 2], 2);
   * // => 1
   *
   * // Search from the `fromIndex`.
   * util.indexOf([1, 2, 1, 2], 2, 2);
   * // => 3
   */
  function indexOf(array, value, fromIndex) {
    var length = array == null ? 0 : array.length;
    if (typeof fromIndex == 'number') {
      fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
    } else {
      fromIndex = 0;
    }
    var index = (fromIndex || 0) - 1,
        isReflexive = value === value;

    while (++index < length) {
      var other = array[index];
      if ((isReflexive ? other === value : other !== other)) {
        return index;
      }
    }
    return -1;
  }