It is by design. All those work in the same direction: dest = src // Variable assignment. <-ch; // Read from channel. // in net/http type Handl

It is by design. All those work in the same direction: dest = src // Variable assignment. <-ch; // Read from channel. // in net/http type HandlerFunc func(w ResponseWriter, req *Request) // in io func Copy(dst Writer, src Reader) // builtin copy(dst, src) // Slices. So the reason is consistency. I suppose the Pipe exception is to map Unix's pipes.