Hacker News Reader

Rust traits do not require dynamic dispatch nor a jump table. Therefore rust traits are inherently faster than zig unions.

They can be used via dynamic dispatch but this is not the default.

View on HN

You just wouldn't use a union if you wanted monomorphization and didn't want e.g. a heterogeneous collection. Even when it is possible, "monomorphize everything" isn't always faster though, because for example ITLBs are not infinitely large.

Reply on news.ycombinator.com