Bug report

phpstan 2.1.18 crashes with an out-of-memory or with --xdebug (and a sufficiently high memory limit) this error:

Internal error: Maximum call stack size of 8339456 bytes (zend.max_allowed_stack_size - zend.reserved_stack_size) reached.

The callstack is from the phar-version, so I assume the line numbers don't exactly match the source code (it seems ConstantArrayType::spliceArray has an endless recursion, but the line numbers don't match 2.1.18 version on github).
callstack.txt

Code snippet that reproduces the problem

I can't create a reproducer-link on the playground, because that also crashes. But I managed to simplify the code to just this small snippet:

class ReproduceMe
{
    public function crashIt(string $addMe = ''): string
    {
        $arg = [];
        if ($addMe !== '') {
            $arg[] = $addMe;
        }

        array_splice($arg, 'extra', 1);

        return implode(' ', $arg);
    }
}

Expected output

It should not crash

Did PHPStan help you today? Did it make you happy in any way?

No response