`assertContains` always claiming it'll return true

[simon-tma]

Reproduction case:

        $this->assertContains('not in the list', new \ArrayObject([1]));

This generates the error:

Call to method PHPUnit\Framework\Assert::assertContains() with 'not in the list' and ArrayObject<int, int> will always evaluate to true.

This is obviously incorrect and appears to happen whenever $haystack is a \Traversable rather than an array.

[axlon]

Seems to be caused by https://github.com/phpstan/phpstan-phpunit/pull/191

[pscheit]

maybe @villfa you can have a lookt at this? 😬

[github-actions[bot]]

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