alt Hacker NewsHow so? It's replacing multiple enum variants, but just one enum, "enum Value".
(also; if anything, the title is implying the exact opposite of "Rust compiler was able to optimize ...", "Replacing a Rust [...] with [...]" is clearly moving away from Rust-magic to something else)
Probably in the sense that you can remove the word rust and nothing changes. It's not about some failure of rust to be efficient at enums, but the title says it is.