I don't like using arguments for key/value data, e.g. `prog --name foo`. Much better to use env vars like `NAME=foo prog`, since the OS handles the mapping auto

I don't like using arguments for key/value data, e.g. `prog --name foo`. Much better to use env vars like `NAME=foo prog`, since the OS handles the mapping automatically, reading them out is trivial in every language, passing args to subprocesses is easier, etc.