Someone can perhaps update me for C11, which I'm not up-to-date on, but at least as of C99, while the details of the specification was perhaps unclear on the sp

Someone can perhaps update me for C11, which I'm not up-to-date on, but at least as of C99, while the details of the specification was perhaps unclear on the specifics, the intent was clear that type-punning (of non-character types) without using unions is UB.