optimizeForTerrain

With terrain on, if `true`, the map will render for performancepriority, which may lead to layer reordering allowing to maximizeperformance (layers that are draped over terrain will be drawn first,including fill, line, background, hillshade and raster). Any layers thatare positioned after symbols are draped last, over symbols. Otherwise, ifset to `false`, the map will always be drawn for layer order priority.By default, it is set to `true`.