remove(value) {
    const uid = getUid(value);

    // get the object in which the value was wrapped when adding to the
    // internal rbush. then use that object to do the removal.
    const item = this.items_[uid];
    delete this.items_[uid];
    return this.rbush_.remove(item) !== null;
  }
Remove a value from the RBush.
@param {T} value Value.
@return {boolean} Removed.