Because my globals are scoped to a file

Maybe I misunderstood your sentence, but my creates a lexical, not a global. The difference is perhaps subtle in this thread, but leads to important issues. I often use Coping with Scoping as a reference for this kind of topics.

Update: Maybe I should correct and rephrase this reply. The opposition is between lexical and package variables. Since package variables are global, I thought that saying that a my variable could be global could drive to misunderstanding.