Switch all S::U::blessed() calls to length(ref()), equivalent in our case
-rw-r--r-- .gitignore
-rw-r--r-- Changes
-rw-r--r-- MANIFEST.SKIP
-rw-r--r-- Makefile.PL
drwxr-xr-x benchmark
drwxr-xr-x lib
drwxr-xr-x t