function baseSortedUniq(array, iteratee) {
      var index = -1,
          length = array.length,
          resIndex = 0,
          result = [];

      while (++index < length) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        if (!index || !eq(computed, seen)) {
          var seen = computed;
          result[resIndex++] = value === 0 ? 0 : value;
        }
      }
      return result;
    }
The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
support for iteratee shorthands.

@private
@param {Array} array The array to inspect.
@param {Function} [iteratee] The iteratee invoked per element.
@returns {Array} Returns the new duplicate free array.