fix map comparison tool crash.
tree60a1b58e323c5bfb9c94f2f455d6afa99ce86690
-rw-r--r-- 81 .gitignore
-rwxr-xr-x 1730 Build.PL
-rw-r--r-- 832 MANIFEST.SKIP
-rw-r--r-- 853 README.md
drwxr-xr-x - bin
drwxr-xr-x - lib
drwxr-xr-x - t