Sounds like quite a mess you've gotten yourself into!
Can you provide some example code of item (1)? I think I understand what you're saying, but there's room for error and I'd like to be sure of what I'm discussing.
As for item (2), what mechanism are you using to share this single file among modules A and B?
require, I assume? If so, making the shared file into a module may provide some benefit, as the namespace would be distinct. Also, using
use, it would be included at compile-time and only once, no matter how many
use statments you have for it. That might provide a performance enhancement.
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