88     private function createType(DocType $type, bool $nullable, string $docType = null): ?Type  argument
90         $docType = $docType ?? (string) $type;
107         if (!$docType || 'mixed' === $docType) {
111         if ('[]' === substr($docType, -2)) {
112             if ('mixed[]' === $docType) {
117                 $collectionValueType = $this->createType($type, false, substr($docType, 0, -2));
123         $docType = $this->normalizeType($docType);
124         list($phpType, $class) = $this->getPhpTypeAndClass($docType);
126         if ('array' === $docType) {
133     private function normalizeType(string $docType): string  argument
135         switch ($docType) {
153                 return $docType;
157     private function getPhpTypeAndClass(string $docType): array  argument
159         if (\in_array($docType, Type::$builtinTypes)) {
160             return [$docType, null];
163         return ['object', substr($docType, 1)];