> An "offline" compiler can't use things like the type information gathered at runtime. This isn't true. At run-time you only need to pay the cost of dispatchi

> An "offline" compiler can't use things like the type information gathered at runtime. This isn't true. At run-time you only need to pay the cost of dispatching once per (type of) input variable. C++-style templates are popular enough that this concept should be readily understood by now: You pay with heavy compile times (IIRC Crystal takes almost a GB of ram to compile its compiler). > Benchmarks should be provided before making performance claims! Yes, absolutely. And reproducible.