Perl did what you told it to by saying use data::dumper:

• find in @INC a data/dumper.pm (the OS showed one exists)
• load it (worked)
• import from that namespace (didn't work because that file doesn't define exactly that namespace and Perl isn't case-forgiving)

It's a problem inherent to case-insensitive (Windows as far as I know) and case-forgiving (MacOS as far as I know) OSes.

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