public function setDefault($default = null)
{
if (self::VALUE_NONE === (self::VALUE_NONE & $this->mode) && null !== $default) {
throw new \LogicException('Cannot set a default value when using InputOption::VALUE_NONE mode.');
}
if ($this->isArray()) {
if (null === $default) {
$default = [];
} elseif (!is_array($default)) {
throw new \LogicException('A default value for an array option must be an array.');
}
}
$this->default = $this->acceptValue() ? $default : false;
}