|Serializable */ function isAOf($value) { Assert::isAOf($value, Serializable::class); return $value; } /** * @psalm-pure * * @param null|object|string $value * * @psalm-return null|class-string|Serializable */ function nullOrIsAOf($value) { Assert::nullOrIsAOf($value, Serializable::class); return $value; } /** * @psalm-pure * * @param iterable $value * * @return iterable|Serializable> */ function allIsAOf($value) { Assert::allIsAOf($value, Serializable::class); return $value; } /** * @psalm-pure * * @param iterable $value * * @return iterable|Serializable|null> */ function allNullOrIsAOf($value) { Assert::allNullOrIsAOf($value, Serializable::class); return $value; }