> The new C23 language has a lot of features that makes your code not compile in previous C versions like attributes digit separators etc.. Someone may wants to

> The new C23 language has a lot of features that makes your code not compile in previous C versions like attributes digit separators etc.. Someone may wants to create a new project in C23 and soon regret because the users of the code may need C99. Ah. I was not aware of this.