Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

utils/convert_s2b_old.go

@@ -0,0 +1,24 @@
+//go:build !go1.20
+
+package utils
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+const MaxStringLen = 0x7fff0000 // Maximum string length for UnsafeBytes. (decimal: 2147418112)
+
+// UnsafeBytes returns a byte pointer without allocation.
+// String length shouldn't be more than 2147418112.
+//
+//nolint:gosec // unsafe is used for better performance here
+func UnsafeBytes(s string) []byte {
+	if s == "" {
+		return nil
+	}
+
+	return (*[MaxStringLen]byte)(unsafe.Pointer(
+		(*reflect.StringHeader)(unsafe.Pointer(&s)).Data),
+	)[:len(s):len(s)]
+}