Packages should be exposing an API with destination slices more often to begin with. The stdlib is pretty good about this (there's a few missing though 1.19 clo

Packages should be exposing an API with destination slices more often to begin with. The stdlib is pretty good about this (there's a few missing though 1.19 closed the most obvious absences), but most third-party code is awful. Or worse, it only takes strings.