private final ExecutionList executionList = new ExecutionList();

    /** Constructor for use by subclasses. */
    protected OldAbstractFuture() {}

    /*
     * Improve the documentation of when InterruptedException is thrown. Our
     * behavior matches the JDK's, but the JDK's documentation is misleading.
     */
    /**
     * {@inheritDoc}
     *

      safeMax = Character.MIN_VALUE;
      safeMin = Character.MAX_VALUE;
    }
    this.safeMin = safeMin;
    this.safeMax = safeMax;
  }

  /*
   * This is overridden to improve performance. Rough benchmarking shows that this almost doubles
   * the speed when processing strings that do not require any escaping.
   */
  @Override
  public final String escape(String s) {

     *
     * Using DoubleUtils.bigToDouble, getting a double approximation of x is extremely fast, and
     * then we can get a double approximation of the square root. Then, we iteratively improve this
     * guess with an application of Newton's method, which sets guess := (guess + (x / guess)) / 2.
     * This iteration has the following two properties:
     *