Your edit makes sense, at least as a first step, but we should reflect how to explain why addr:floor is described as an alternative to level:ref, and not as a "possible tagging mistake". Are there subtle differences? If not, I would prefer to choose one and discourage the other. 10.000 uses are not completely ignorable, but they still indicate this is in the beginning, given that we have millions of POIs.
Cheers Martin
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