|static function cacheKey()|
Create a unique hashkey for the router.
The router’s url map can change based on the version of the software you’re running and the plugins that are enabled. To avoid having bad routes get stuck in the cache, the key includes a list of plugins and the software version.
There can still be problems with a) differences in versions of the plugins and b) people running code between official versions, but these tend to be more sophisticated users who can grok what’s going on and clear their caches.
- string cache key string that should uniquely identify a router