If something isn't part of the formal Common Core standard, but is part of the "reference implementation," then practically speaking calling it part of Common C

If something isn't part of the formal Common Core standard, but is part of the "reference implementation," then practically speaking calling it part of Common Core is usefully descriptive. We use this kind of synecdoche all the time when we do things like say Blub is a high performance programming language. If you want to be pedantic it's actually the Blub language, the Blub compiler, and the Blub runtime as a whole that determine whether or not Blub programs execute performantly. Sure it's useful to be aware of the distinction, but it's annoying and even disruptive to get caught up on it when everyone knows what is meant.