is adding a dependency on File::Copy for trivial task a bad idea?

What sleet is saying here is that it's absolutely not a bad idea to add the dependency to your chain, particularly because it's already in core. Personally, I have quite a few distributions on the CPAN that I wanted to make small, but when it comes to core modules, I'm all in on including them and decreasing my work-load for known-good functionality.

In reply to Re^4: Choosing namespace/name for (my first) CPAN module which is a sub-class of a well-known distribution by stevieb
in thread Choosing namespace/name for (my first) CPAN module which is a sub-class of a well-known distribution by Anonymous Monk

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