On the one hand, I can 110% see why you want to reduce boilerplate code and provide a discoverable, common mechanism for automating the two and three-quarters parsers that a lot of applications have to write to handle a config file, CLI, and/or registry values, but why introduce a syntax for it? A module would do just fine in terms of function. Are you worried about the look of it, or do you want to make a change to make it seem more "mainstream"? I don't see the rationale.
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