Edge case: renaming /user to /admin locks you out of your admin pages

If you use this module to change the /user path to /admin you'll get locked out of many admin pages.

I think this is because Drupal interprets URLs like /admin/modules as looking for a user with an ID of modules.

This module could protect against this situation by including admin on a blacklist of words you can't rename it as, and throwing an error if somebody tries to rename it as that word.

There might be other words that cause issues that I haven't seen yet (like, I wonder what would happen if you rename all admin paths to /user).