add assert_defined and assert_not_defined, plus tests (though I don't think these...
-rw-r--r-- 21 .gitignore
-rw-r--r-- 8902 LICENSE
-rw-r--r-- 309 README
drwxr-xr-x - library
drwxr-xr-x - ports
drwxr-xr-x - released
-rw-r--r-- 8499 setup.nqp
drwxr-xr-x - src
drwxr-xr-x - t