public function setMinPlays($minPlays)
    {
        if (is_int($minPlays) === true && $minPlays >= 0) {
            $this->minPlays = $minPlays;
        } else {
            $msg = "The 'minPlays' argument must be a positive (>= 0) integer, '" . gettype($minPlays) . "' given.";
            throw new InvalidArgumentException($msg);
        }
    }