I looked this up after you mentioned it upthread, I thought you meant implementation-defined, but I learned that yeah, this exists too. The difference is that i

I looked this up after you mentioned it upthread, I thought you meant implementation-defined, but I learned that yeah, this exists too. The difference is that implementation-defined requires documentation of the choice made, whereas unspecified does not. However, > the behavior isn't constrained C++23, at least, does say > The range of possible behaviors is usually delineated by this document. So there are sometimes some constraints.