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  1. or download this
    split up query string and decode pairs into $val and $key
insert $key into params hash with value $val
  2. or download this
    foo.cgi?foo=mashed&foo=fried&foo=boiled&foo=tofu
  3. or download this
    if (defined $params{$key} && ref($params{$key}) eq "ARRAY") {

...
    # assign the value as a scalar
    $params{$key} = $val; 
}