I believe the most important feature from the Math extensions proposal (last presented in 2016) is the Math.clamp function but the proposal as a whole has since gone quiet. Perhaps it was its amibition for features had eventually caused a roadblock in development.

But regardless, I wanted to take out only the Math.clamp function from the proposal and improve upon it in its own proposal. I'm not sure how the process of finding a champion, or for that matter, getting feedback in the first place goes, but I'll just put this out there.

You might want to reach out to @jschoi and see if they would be interested in championing this proposal. Seems like it would be easy to argue that it is motivated.

I am interested in championing (the explainer linked above looks pretty good), but I probably would not have the bandwidth to do so until after at least BigInt Math resolves.

They are not the same. Median of 3 must do 3 comparisons, clamp only does 2. Clamp doesn't bother checking whether low <= high, you're supposed to "sort" the boundary arguments. When low > high, clamp returns low (or high, may depend on implementation), not the median.