Its also worth underlining that it's not just "The parsing computation is fast enough that V8's JIT eliminates any Rust advantage", but specifically that this k

Its also worth underlining that it's not just "The parsing computation is fast enough that V8's JIT eliminates any Rust advantage", but specifically that this kind of straight-forward well-defined data structures and mutation, without any strange eval paths or global access is going to be JITed to near native speed relatively easily.