Though I'm not quite sure how tests 3-5 are supposed to go
Neither was I! So I made it die
(a.k.a throws an exception) when the array consists only of NULLs. Garbage in, garbage out
, as we used to say. Exceptions prevent the garbage leaking out.
If you decide it should do something other than die, just change this line:
die "No values found" if @arr && 0 == grep $_ ne '_', @arr;
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