You needn't test for whether $ENV{QUERY_STRING} is defined or not, because undefined things automatically have zero length.
"CGI.pm then would generate a parameter "keywords=Test", and we would remove that parameter accordingly. But that would be only the half of the way: I think that "Test" in that case should be a KEY in the parameter list which has an empty (or undefined) value."
Then you could try something like:
for ($ENV{QUERY_STRING}) {
$cgi->{param}{delete $cgi->{param}{keywords}} = ""
if length && !/[&=]/;
}
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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