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Position symbol on buildings (both fill extrusions and models) roof tops. In order to have minimal impact on performance, this is supported only when fill-extrusion-height is not zoom-dependent and not edited after initial bucket creation. For fading in buildings when zooming in, fill-extrusion-vertical-scale should be used and symbols would raise with building roofs. Symbols are sorted by elevation, except in case when viewport-y sorting or symbol-sort-key are applied.