Odd metadata issues

Hello! This is a very cool project.

I've been trying to do styling of the most-current basemaps, and I've noticed lots of odd metadata errors. For example, the min_zoom on place=state entities outside of the United States is arbitrarily high (e.g., Northern Ireland doesn't show up until zoom=9, which is so zoomed in that it is kind of useless; Rhode Island is available at zoom=2, by comparison). And pmap:population_rank seems really wrong in some cases (Mexico has a population_rank of 1 with a population of 127 million, Cuba has a population_rank of 14 with a population of 11 million).

Anyway, my question is just: where is this particular metadata data being drawn or derived from? Mexico's OSM data did not have a population tag, so it makes sense that this might throw off its population_rank calculation. I checked and Norway also has no population data in the latest map built, even though its OSM entry does have it and has for some time. So I don't know.

My guess is that the zoom levels for states is also based on a population rank like most places? If so, perhaps it should be made a bit more liberal where place=state, because it is a little inflexible in its current form.

Thank you!