[Tagging] Is there any case of valid numeric addr:housename - for example addr:housename?

[Mateusz Konieczny]

We have 15000 addresses such as addr:housename=3 ( http://overpass-turbo.eu/s/VBS )

Is there some chance that any of them is valid? Because it seems to me that
editors should complain about addr:housename with just numbers.

I want to check worldwide situation before proposing doing it in say JOSM.
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