Bug report

Using array_map() produces an unexpected result with array_search():

Strict comparison using === between false and 0|1|2 will always evaluate to false.

However, array_search() can also return false (https://www.php.net/array_search):

Returns the key for needle if it is found in the array, FALSE otherwise.

For now, I've added /** @var array<int, string> $supported */ before the $supported declaration as an workaround.

Code snippet that reproduces the problem

✅ Works » https://phpstan.org/r/ae4801c3-0f97-45b4-a40b-171e51d7ebee

❌ Doesn't work » https://phpstan.org/r/7693163e-7db7-47fa-950d-baf59ec3f84c

Expected output

Expected no errors with the code snippet that reproduces the problem.