Then raise a bug or a patch against the module(s).
Unless the modules explicitly documents that it uses whatever value you assign to $/ or $\, eg. Tie::File, then no module author has the right to either rely upon some default value, or modify them except for local use. That right belongs exclusively to that author of main::main.
Even if you scope and localise modifications to these variables, if you also need to call a module's functions or methods within that scope, you will break them if they make assumptions.
Module authors should never make assumptions about or permanently change the environment they will inherit. That privilege remains the exclusive preserve of the author of main.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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