Why is clang++ falling behind on c++ 20 support so much?

clang/clang++ used to be the leader but recent years it is behind gcc/g++, the gap seems getting wider in each release, specifically the new c++ support. any plan to address that?

Like any Open Source project. The project evolves as the involved developers want to.

But there is a lot of movement around C++20 currently and 15.x release will add some features to both the compiler and libc++.

Is there a specific feature you want to use?