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leisure=garden is rendering pink where it should be green:
Just a guess, but might it also be that being tagged tourism=attraction is just a difference in which tag takes priority? So more of a tagging issue than a rendering one?
Although this is an artifact of #15, I think there's a wider question regarding how we handle tourist attractions. I've seen chunks of the Thames tagged as a tourist attraction, which thankfully doesn't turn it bright pink. But it raises the question of why some attractions end up pink, some don't, and what we'd like to happen.
Rather than leaving it to chance ordering of polygons, how should attractions actually be handled, both when that's the only tag and also when it has other tags?
Closing this - will revisit the wider questions in due course