<p></p>
<blockquote>
<p dir="auto">The question is if this is intended behaviour that will be maintained going forward and can be documented, or if this is simply an unintended implementation consequence that cannot be relied on?</p>
</blockquote>
<p dir="auto">I think the best answer to that is to check the tests. If it's covered by the tests, it's likely to keep working, or at least provoke a discussion if it needs to be changed. But if there's some edge-case behaviour that's not covered by tests, it might change without anyone noticing, and so I wouldn't rely on it too much.</p>

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