/**
* Sets an inflected word in the cache.
*
* @param string $singular The singular form of the word.
* @param string $plural The plural form of the word. If omitted, it is assumed the singular and plural are identical.
*
* @return void
*
* @since 2.0
*/
private function setCache($singular, $plural = null)
{
$singular = Utf8String::strtolower($singular);
if ($plural === null) {
$plural = $singular;
} else {
$plural = Utf8String::strtolower($plural);
}
$this->cache[$singular] = $plural;
}
