protected function clampEstimate()
    {
        $this->clamped = false;

        // Clamp
        if ($this->estimate > $this->options['max']) {
            $this->clamped  = true;
            $this->estimate = (int)$this->options['max'];
        }

        if ($this->estimate < $this->options['min']) {
            $this->clamped  = true;
            $this->estimate = (int)$this->options['min'];
        }
    }