Better check for XS-availability (and bump to M::I which provides it)
-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