Do a second pass to clean up the code/comments and make further optimizations
值得注意的是，针对此前备受用户吐槽的「微信文件重复保存吃内存」问题，微信官方此次也借机作出了明确回应：。业内人士推荐爱思助手下载最新版本作为进阶阅读
Add us as a preferred source on Google。关于这个话题，爱思助手下载最新版本提供了深入分析
# Inject at runtime, never store on disk
Crucially, this distribution of border points is agnostic of routing speed profiles. It’s based only on whether a road is passable or not. This means the same set of clusters and border points can be used for all car routing profiles (default, shortest, fuel-efficient) and all bicycle profiles (default, prefer flat terrain, etc.). Only the travel time/cost values of the shortcuts between these points change based on the profile. This is a massive factor in keeping storage down – map data only increased by about 0.5% per profile to store this HH-Routing structure!