While playing with deployment I found out that some libraries provide this feature that you can put {:system, var} in configuration and then it's resolved at runtime. However if it's in my code, I'd have to implement it on my own. Wouldn't it be nice if it was supported by Application module by default? Something like: def get_env(app, key, default \\ nil) do case :application.get_env(app, key, default) do {:system, var} -> System.get_env(var) || default rest -> rest end end
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