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Feature request: allow validating keys that aren't declared in types

Feature request: allow validating keys that aren't declared in types: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm using nopt to parse arguments for a CLI tool. I declare the keys I expect via the types map and pass an invalidHandler to react to bad input…

The task

I'm using `nopt` to parse arguments for a CLI tool. I declare the keys I expect via the `types` map and pass an `invalidHandler` to react to bad input. That works great for known keys.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.