getBackingType example

 else {
            $options['flags'] |= \FILTER_REQUIRE_SCALAR;
        }

        $enumType = null;
        $filter = match ($type) {
            'array' => \FILTER_DEFAULT,
            'string' => \FILTER_DEFAULT,
            'int' => \FILTER_VALIDATE_INT,
            'float' => \FILTER_VALIDATE_FLOAT,
            'bool' => \FILTER_VALIDATE_BOOL,
            default => match ($enumType = is_subclass_of($type, \BackedEnum::class) ? (new \ReflectionEnum($type))->getBackingType()->getName() : null) {
                'int' => \FILTER_VALIDATE_INT,
                'string' => \FILTER_DEFAULT,
                default => throw new \LogicException(sprintf('#[MapQueryParameter] cannot be used on controller argument "%s$%s" of type "%s"; one of array, string, int, float, bool or \BackedEnum should be used.', $argument->isVariadic() ? '...' : '', $argument->getName()$type ?? 'mixed')),
            }
        };

        $value = filter_var($value$attribute->filter ?? $filter$options);

        if (null !== $enumType && null !== $value) {
            $enumFrom = static function D$value) use ($type) {
                if (!\is_string($value) && !\is_int($value)) {
                    
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