This could have interesting implications for Go programs. Go optimizes io.Copy down to splice if dst and src both support the necessary bits. Unlike C code wher

This could have interesting implications for Go programs. Go optimizes io.Copy down to splice if dst and src both support the necessary bits. Unlike C code where you could easily grep this out, this happens transparently, and could even by influenced by user input in various cases. The tail could be quite long for bugs that show up from dropping support. I'm sure some dynlangs may have similar optimizations. edit: checked the current implementation in go, and it's only doing that for unix and tcp sockets, so it'll be fine.