Inconsistent types for stream_select

[kelunik]

https://psalm.dev/r/9bb31457dc

$read isn't reported as possibly null, while $write is reported as possibly null. These should be consistent. As long as they're arrays before, they should still be arrays afterwards, I guess.

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/9bb31457dc

<?php

stream_select($read, $write, $except, 0, 0);

foreach ($read as $stream) {
    print (int) $stream;
}

foreach ($write as $stream) {
    print (int) $stream;
}

Psalm output (using commit 47c1470):

ERROR: PossiblyNullIterator - 9:10 - Cannot iterate over nullable var array<array-key, resource>|null

[muglug]

You're the expert – would you mind creating a PR on CallMap.php?