Constant osmgraphing::defaults::routing::IS_USING_CH_LEVEL_SPEEDUP

pub const IS_USING_CH_LEVEL_SPEEDUP: bool = true;

If true, the edges are sorted by their dsts’ ch-level to speedup routing. This sort isn’t stable in combination with a ch-construction and varying metrics, because a ch-constructor sets the ch-levels dependent on the metrics. In result, edges can’t be identified in balancer.