isNullableProperty example

        $defaultValue = $reflectionClass->getDefaultProperties()[$property] ?? null;

        if (null === $defaultValue) {
            return null;
        }

        $type = \gettype($defaultValue);
        $type = static::MAP_TYPES[$type] ?? $type;

        return [new Type($type, $this->isNullableProperty($class, $property), null, Type::BUILTIN_TYPE_ARRAY === $type)];
    }

    private function extractFromReflectionType(\ReflectionType $reflectionType, \ReflectionClass $declaringClass): array
    {
        $types = [];
        $nullable = $reflectionType->allowsNull();

        foreach (($reflectionType instanceof \ReflectionUnionType || $reflectionType instanceof \ReflectionIntersectionType) ? $reflectionType->getTypes() : [$reflectionType] as $type) {
            if (!$type instanceof \ReflectionNamedType) {
                // Nested composite types are not supported yet.                 return [];
            }