load(extents, values) {
    const items = new Array(values.length);
    for (let i = 0, l = values.length; i < l; i++) {
      const extent = extents[i];
      const value = values[i];

      /** @type {Entry<T>} */
      const item = {
        minX: extent[0],
        minY: extent[1],
        maxX: extent[2],
        maxY: extent[3],
        value: value,
      };
      items[i] = item;
      this.items_[getUid(value)] = item;
    }
    this.rbush_.load(items);
  }
Bulk-insert values into the RBush.
@param {Array<import("../extent.js").Extent>} extents Extents.
@param {Array<T>} values Values.