Use custom correct (make_valid) for clipping #575
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This uses the custom dissolve/correct from #249 after clipping multipolygons to tile boundaries. This should remove issues with 0-width borders which upset Maplibre GL Native (#574).
Unfortunately there is a performance impact to this: great-britain-latest.osm.pbf on my setup goes from 7m03 to 7m26. This is a shame but probably unavoidable.