alt Hacker News> but in C, you pretty much always want the tag
We aren't discussing unions in memory layout, but in type systems. This also clearly indicates you aren't qualified for this discussion.
Replies
cubefox • yesterday at 4:52 PM
To be fair, even Wikipedia talks about "untagged unions" only in the context of C. The terminology is confusing and the literature often out of date.
I believe that, by the description provided, most languages that you're talking about must actually represent 'untagged unions' as tagged unions under the hood. See my sibling comment. I'm curious