Sorry, but my contention is that there almost certainly isn't code right now that depends upon this behaviour.

The current behaviour is so inherently non-useful, almost unpredictable, that I think it impossible that anyone has found a use for it. Leaving it as it is, just means perpetuating a non-useful, unusable behaviour where a useful behaviour could be provided.

I can't believe that you, of all people, are suggesting that the rest of the world eshew a possible, advanced behaviour just because it is not one that you personally have ever thought to try, or because it is easily achieved by the combination of two simpler ones?

Of course this is only my opinion and that carries exactly as much weight as anyone cares to give it, but the logic of:

Don't make something not useful into something useful because it might break something that is non-useful, but pre-existing.

I find faintly ludicrous.