[Sharlin]

Problem is contracts mean different things to different people, and that leads standard contracts support being a compromise that makes nobody happy. To some people contracts are something checked at runtime in debug mode and ignored in release mode. To others they’re something rigorous enough to be usable in formal verification. But the latter essentially requires a completely new C++ dialect for writing contract assertions that has no UB, no side effects, and so on. And that’s still not enough as long as C++ itself is completely underspecified.

[bluGill]

This contacts was intended to be a minimum viable product that does a little for a few people, but more importantly provides a framework that the people who want everything else can start building off of.