chore: decrease direct depend on the sing package

common/buf/sing.go

@@ -0,0 +1,19 @@
+package buf
+
+import (
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+)
+
+type Buffer = buf.Buffer
+
+var StackNewSize = buf.StackNewSize
+var KeepAlive = common.KeepAlive
+
+//go:norace
+func Dup[T any](obj T) T {
+	return common.Dup(obj)
+}
+
+var Must = common.Must
+var Error = common.Error