Perhaps I made an error copying my working example into PerlMonks - but foo reloads without complaint. Only reload warns.
I will have to look and see what you're seeing, vs what I'm seeing. Possibly a difference in perl versions, more likely I mucked up the copying in.

Curious you make one work, and I make the other work, yet the twain do not meet.

JP,
-- Alexander Widdlemouse undid his bellybutton and his bum dropped off --