if (isset($a[Caster::PREFIX_PROTECTED.'serializer'])) {
$ser = $a[Caster::PREFIX_PROTECTED.'serializer'];
$a[Caster::PREFIX_PROTECTED.'serializer'] = isset(self::$serializer[$ser]) ? new ConstStub(self::$serializer[$ser], $ser) : $ser;
if (isset($a[Caster::PREFIX_PROTECTED.'serializer'])) {
$ser = $a[Caster::PREFIX_PROTECTED.'serializer'];
$a[Caster::PREFIX_PROTECTED.'serializer'] = isset(self::$serializer[$ser]) ? new ConstStub(self::$serializer[$ser], $ser) : $ser;