Reduce startup overhead of file I/O and module loading a bit
Reduce startup overhead of file I/O and module loading a bit

Punning the buf8 role costs a couple of milliseconds when loading modules.
We can move this overhead to compile time of the setting instead.

lucasbuchala/rakudo,softmoth/rakudo,nbrown/rakudo,softmoth/rakudo,nbrown/rakudo,tony-o/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,tbrowder/rakudo,softmoth/rakudo,lucasbuchala/rakudo,tony-o/rakudo,nbrown/rakudo,nbrown/rakudo,Gnouc/rakudo,rakudo/rakudo,salortiz/rakudo,Gnouc/rakudo,tbrowder/rakudo,rakudo/rakudo,rakudo/rakudo,Gnouc/rakudo,Gnouc/rakudo,salortiz/rakudo,labster/rakudo,MasterDuke17/rakudo,rakudo/rakudo,softmoth/rakudo,labster/rakudo,tbrowder/rakudo,salortiz/rakudo,softmoth/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,rakudo/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,salortiz/rakudo,rakudo/rakudo,nbrown/rakudo,tony-o/rakudo,labster/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/rakudo,salortiz/rakudo,tony-o/rakudo,labster/rakudo,tony-o/rakudo,salortiz/rakudo,MasterDuke17/rakudo,nbrown/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,labster/rakudo