static fuzz_(value, fuzzFactor) {
    // A random number between -1 and +1.
    const negToPosOne = (Math.random() * 2.0) - 1.0;

    // A random number between -fuzzFactor and +fuzzFactor.
    const negToPosFuzzFactor = negToPosOne * fuzzFactor;

    // The original value, fuzzed by +/- fuzzFactor.
    return value * (1.0 + negToPosFuzzFactor);
  }
Fuzz the input value by +/- fuzzFactor.  For example, a fuzzFactor of 0.5
will create a random value that is between 50% and 150% of the input value.

@param {number} value
@param {number} fuzzFactor
@return {number} The fuzzed value
@private