csv() is unexpectedly restrictive, and non-streaming.
It would be nice if the following would work, and processed records one at a time instead of slurping the whole file.
use Text::CSV_XS qw( csv );
csv( in => "a.csv", out => "b.csv", ... );
It does suggest how the call could be rewritten so the above works (nice), but it loads the entire file.
Honestly, I just want jq to support CSV :) (It can generate it, but not read it.)
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