@yched remarked in #2429617: [PP-1] Make D8 2x as fast: SmartCache: context-dependent page caching (for *all* users!), and many including myself have also noticed that the name for the cache contexts service is quite unfortunate. It can be pretty confusing when you have something like:
$cache_contexts = ['foo', 'bar'];
$keys = $this->cacheContexts->convertTokensToKeys($cache_contexts);It'd be better if it had a more distinct name. What about a "manager" suffix? It'd then look like this:
$cache_contexts = ['foo', 'bar'];
$keys = $this->cacheContextsManager->convertTokensToKeys($cache_contexts);