Method slice

src/Repeat.js:45–53

(begin, end)

  }

  slice(begin, end) {
    const size = this.size;
    return wholeSlice(begin, end, size)
      ? this
      : new Repeat(
          this._value,
          resolveEnd(end, size) - resolveBegin(begin, size)
        );
  }

  reverse() {
    return this;