False-positive when destructuring callable-array

[jaikdean]

The callable-array type doesn't appear to be correctly treated as an array.

https://psalm.dev/r/cfc2aac7c2

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/cfc2aac7c2

<?php
  
function getCallable(): callable {
    return [DateTimeImmutable::class, 'createFromFormat'];
}

$callable = getCallable();

if (!is_array($callable)) {
  exit;
}

[$classOrObject, $method] = $callable;

Psalm output (using commit c50fa27):

ERROR: InvalidArrayOffset - 13:1 - Cannot destructure non-array of type callable-array{0: class-string|object, 1: string}

INFO: UnusedVariable - 13:2 - Variable $classOrObject is never referenced

INFO: UnusedVariable - 13:18 - Variable $method is never referenced