--- CBOR-XS/XS.xs	2016/04/24 20:08:41	1.54
+++ CBOR-XS/XS.xs	2016/11/25 06:13:16	1.55
@@ -944,14 +944,16 @@
 
       case CBOR_TAG_STRINGREF_NAMESPACE:
         {
-          ENTER; SAVETMPS;
+          // do nmot use SAVETMPS/FREETMPS, as these will
+          // erase mortalised caches, e.g. "shareable"
+          ENTER;
 
           SAVESPTR (dec->stringref);
           dec->stringref = (AV *)sv_2mortal ((SV *)newAV ());
 
           sv = decode_sv (dec);
 
-          FREETMPS; LEAVE;
+          LEAVE;
         }
         break;