[irh]

In my tests it's been ~1.5-2x faster than Rhai, but Koto's still some way behind Lua in benchmarks so I'm not trying to make a big claim here (although that said one of the reasons I started work on Koto was to avoid the runtime overhead of Lua <-> Rust conversions, e.g. Koto shares the same string representation as Rust, Koto lists are just wrapped `Vec`s, etc).