I've noticed my bar for "fast" has gone down quite a bit since the o1 days. It used to be one of the main things I evaluated new models for, but I've almost completely swapped to caring more about correctness over speed.
I believe satisfies will narrow the type const infers. It won't lose any information, so you can check it satisfies a broader type without stopping it being used as a narrower one, but it will narrow down the inference if given (but you can of course widen it back out with an explicit typing).
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