I understand the request, but I see this syntax as too conflicting with the existing syntax.

IF a function like that is to return an object of any kind, it would be a Text::CSV_XS object, more like this:

my $csv = openCsv (file => "file.csv", headers => "auto");
while (my $row = $csv->getline) { # note the missing $io
    say $row->{Foo};
    }
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This fits nicely in the rest of the code and documentation and I will consider something like this (no promises).