foreach my $k (@{$aref}) {
  if ($k->{"group"} eq $group) {
    $k->{"version"} = [ sort uniq $version, @{$k->{"version"}} ];
    $key = 0;
  }
}
push @{ $aref }, {
    group => $group,
    versions => [ $version ]
} if ($key);

##</code><code>##

{                              
   "group": "pkgs",            
   "values": [ "tcsh" ]                          
},