See my comment here - https://news.ycombinator.com/item?id=50361418
However, i also understand the reasoning behind this C++26 contracts proposition - https://news.ycombinator.com/item?id=50364593
While i understand the rationale here, i can also see the problems it might lead to in the future. Correctness concerns should be an all-or-nothing proposition, you cannot do it piecemeal. Hence whether you want to call it "profiles" or not, i would like a Eiffel/Ada-SPARK like system which gives me complete static compile-time analysis and verification along with separate run-time guarantees.
The contracts committee should go back to the drawing board and come up with a more comprehensive solution.
This is a real chance to finally realize the "Safe C++" dream! Ada did it and so can C++.