Method slice

src/List.js:200–210

(begin, end)

  // @pragma Iteration

  slice(begin, end) {
    const size = this.size;
    if (wholeSlice(begin, end, size)) {
      return this;
    }
    return setListBounds(
      this,
      resolveBegin(begin, size),
      resolveEnd(end, size)
    );
  }

  __iterator(type, reverse) {
    let index = reverse ? this.size : 0;