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  1. or download this
    my $var :shared;
$var = 1;              # ok
$var = [];             # error
$var = &share([]);     # ok
  2. or download this
    my %hash :shared = ( ... );
$DataQueue->enqueue(\%hash);
  3. or download this
    # Fixed as per BrowserUK's reply.
# Initialization must be done after share.
my $href = share({});
%$href = ( ... );
$DataQueue->enqueue($href);
  4. or download this
    use Storable qw( freeze thaw );
my %hash = ( ... );
$DataQueue->enqueue(freeze(\%hash));