anchor.diff:     * the specified [byteOffset] in this object, in two's complement binary
      * form.
      *
  -   * The return value will be between 2<sup>15</sup> and 2<sup>15</sup> - 1,
  +   * The return value will be between -2<sup>15</sup> and 2<sup>15</sup> - 1,
      * inclusive.
      *
      * Throws [RangeError] if [byteOffset] is negative, or
  
positive.code:    * [value], which must fit in four bytes.
     *
     * In other words, [value] must lie
     * between 2<sup>31</sup> and 2<sup>31</sup> - 1, inclusive.
     *
     * Throws [RangeError] if [byteOffset] is negative, or
     * `byteOffset + 4` is greater than the length of this object.
  
negative.code:    * the specified [byteOffset] in this object, in two's complement binary
     * form.
     *
     * The return value will be between -2<sup>63</sup> and 2<sup>63</sup> - 1,
     * inclusive.
     *
     * Throws [RangeError] if [byteOffset] is negative, or
  