Typed reads of environment variables a plugin declared via env_vars/0.

System.get_env/1 always returns a string, so every caller ends up writing its own == "true" or String.to_integer/1 — and each one invents its own answer for a missing or malformed value. Declaring the variable once gives the coercion a single home:

def env_vars do
  [%{name: "MYGAME_DIFFICULTY", default: "normal", description: "..."},
   %{name: "MYGAME_MAX_BOTS", default: 8, description: "..."},
   %{name: "MYGAME_TUTORIAL", default: true, description: "..."}]
end

Config.get("MYGAME_MAX_BOTS")   #=> 8      (integer, from the default)
Config.get("MYGAME_TUTORIAL")   #=> true   (boolean)

The type is inferred from the declared default, so default: 8 reads as an integer without a separate :type key. Declare :type explicitly only when the default cannot carry it — typically a secret with default: nil.

A value that does not parse falls back to the default and logs, because a typo in an env var should not take the server down at read time.