> C++ has a lot of features which are not best practices. For example, you're not supposed to use the builtin arrays anymore, in favor of vector<>.
Again, you know better than this. I don't know why you are making these claims, and it's very disappointing to see you make whole sequences of them.
There are no "built-in" arrays in C++. There's C-style arrays, which are there for compatibility with C, and then there's C++'s STL. Since C++'s inception, the recommendation is to use C++'s containers. In STL, there is std::array and std::vector. Which one you pick, it's up to your use case.
This isn't a gotcha. This is C++ 101.
> There are no "built-in" arrays in C++. There's C-style arrays,
They're built-in arrays. The C++11 n3290 specification calls them arrays in section 8.1. The use of "array" is used regularly elsewhere in the specification. They are built in to the language. There is no warning from clang compiling C++ code that these should not be used.
The trouble with C++ builtin arrays is they have no bounds checking and promptly decay to pointers at every opportunity. Despite the obsolete nature of them, people still use them. There's no switch to turn them off.
Where's the C++ guarantee that code doesn't use those builtin arrays?