well I guess I expect the “runtime cache” to exist within the Plug.
to me init means setup the plug once initially, so not necessarily at compile time, but preferably at runtime using environment variables.
then call means use the configured settings that are already in place.
I would like to not only read values from environment variables into settings but also validate those settings as soon as the application starts (once). it seems “init” would be a nice place to be able to do that, just like Repo.init/2 and Endpoint.init/2.
