c++20's u8strings took a giant steaming dump on a number of existing projects, to the point that compiler flags had to be introduced to disable the feature just

c++20's u8strings took a giant steaming dump on a number of existing projects, to the point that compiler flags had to be introduced to disable the feature just so c++20 would work with existing codebases. Granted that's utf-8 (not the same thing as unicode, as mentioned) but it's there.