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#!/usr/bin/perl --
use Data::Dump qw/ dd /;
...
  "param"        => { a => ["b", "c"], d => ["e"], f => ["g"] },
  "use_tempfile" => 1,
}, "CGI")

#!/usr/bin/perl --
use Data::Dump qw/ dd /;
use CGI;
...
}, "CGI")
("a", "b\0c\0d", "d" .. "g")
{ a => ["b", "c\0d"], d => ["e"], f => ["g"] }