* separator.
     */
    abstract int separatorStart(int start);

    /**
     * Returns the first index in {@code toSplit} after {@code separatorPosition} that does not
     * contain a separator. This method is only invoked after a call to {@code separatorStart}.
     */
    abstract int separatorEnd(int separatorPosition);

    int offset = 0;
    int limit;

     * separator.
     */
    abstract int separatorStart(int start);

    /**
     * Returns the first index in {@code toSplit} after {@code separatorPosition} that does not
     * contain a separator. This method is only invoked after a call to {@code separatorStart}.
     */
    abstract int separatorEnd(int separatorPosition);

    int offset = 0;
    int limit;