ffjson.diff

diff --git a/fflib/v1/jsonstring.go b/fflib/v1/jsonstring.go
index 513b45d..fd70988 100644
--- a/fflib/v1/jsonstring.go
+++ b/fflib/v1/jsonstring.go
@@ -24,10 +24,12 @@ package v1
 
 import (
        "io"
-       "unicode/utf8"
+       "reflect"
        "strconv"
-       "unicode/utf16"
        "unicode"
+       "unicode/utf16"
+       "unicode/utf8"
+       "unsafe"
 )
 
 const hex = "0123456789abcdef"
@@ -38,8 +40,19 @@ type JsonStringWriter interface {
        stringWriter
 }
 
+func s2b(s string) (b []byte) {
+       bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+       sh := *(*reflect.StringHeader)(unsafe.Pointer(&s))
+       bh.Data = sh.Data
+       bh.Len = sh.Len
+       bh.Cap = sh.Len
+       return b
+}
+
 func WriteJsonString(buf JsonStringWriter, s string) {
-       WriteJson(buf, []byte(s))
+       // WriteJson will not keep any pointers to its []byte argument
+       // so using s2b here is completely safe.
+       WriteJson(buf, s2b(s))
 }
 
 /**