experimental IFn optmization for known IFn impls
experimental IFn optmization for known IFn impls

dangerous if used incorrectly but can reduce a bunch of code
for known IFn impls, just like regular not-native

thheller/shadow-devtools,thheller/shadow-devtools,thheller/shadow-cljs,thheller/shadow-cljs,thheller/shadow-cljs,thheller/shadow-devtools,thheller/shadow-cljs,thheller/shadow-devtools