shouldSample(roll) {
    ++this._seen
    if (roll >= this._samplingThreshold) {
      this._incrementSampled()
      return true
    }

    return false
  }
Determines if an object should be sampled based on the object's priority and
the number of objects sampled in this window.

@param {number} roll - The number to compare against the threshold
@returns {boolean} True if the object should be sampled.