> The fact that they are essentially global variables should be enough to deter usage of them Env var behaviour is much closer to dynamic variables, rather tha

> The fact that they are essentially global variables should be enough to deter usage of them Env var behaviour is much closer to dynamic variables, rather than global variables (which I argue at http://www.chriswarbo.net/blog/2021-04-08-env_vars.html http://www.chriswarbo.net/blog/2021-04-08-env_vars.html ) Either way, I agree that mutating them is usually a bad idea; though I find them very good for constant (or dynamically-bound) config.