Enable runtime UB checks in libstdc++

Question

Is it possible with g++/libstdc++ to enable runtime UB checks, so that for example:

• std::vector::operator[] behaves the same as std::vector::at()
• std::optional::operator* behaves the same as std::optional::value()

I do not want to detect language level UB (that requires something like ubsan). I just want reasonable "safe" behaviour in the standard library. These should be checks appropriate for production, not ubsan/address-sanitizer.