Zig has the concept of illegal behavior, of which a subset is unchecked illegal behavior - basically undefined behavior, but if evaluated at comptime, it results in a compile error. The documentation also states that most illegal behavior is safety-checked unless you use the ReleaseFast or ReleaseSmall optimization modes (and don't enable safety checks for individual blocks).
I liked Zulip a lot until that Flutter rewrite. Maybe it's more accessible now but the new look is not for me. I believe the app navigation is largely unchanged, and still doesn't quite feel right. I love the topic-based model nonetheless.
Funny you would mention GitLab - I find it extremely clunky, especially compared to GitHub. Maybe GitHub is primitive in comparison, but it never makes me hunt for basic functionality and the search just works for about everything.
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