## Poor example: Cwd pulled in with use so %Cwd:: is fully populated 
$ perl -E 'say qq{Cwd stash keys: }, scalar %Cwd::; use Cwd; say qq{Cwd stash keys after use: }, scalar %Cwd::; say qq{Config stash keys: }, scalar %Config::;require "Config.pm"; say qq{Config stash keys after requiire: }, scalar %Config::;'

Cwd stash keys: 39
Cwd stash keys after use: 39
Config stash keys: 1
Config stash keys after requiire: 20