PHPStan is checking whether all possible outcomes of a match expression are used. But for isset it's reporting an error despite true and false are used.

Code snippet that reproduces the problem

/// PHPStan: Match expression does not handle remaining value: bool
match (isset($foo)) {
    true => 'a',
    false => 'b',
};

https://phpstan.org/r/4d740289-69d9-4071-825f-014bd4bdfecc

Expected output

The code is correct, as it has a branch for the true and false value.