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sub merge {
   if(wantarray) {
...
      return join('',@_);
   }
}

my %hash = merge(%hash1,%hash2);

my @array = merge(@array1,@array2);
my $scalar = merge($scalar1,$scalar2);
...
# or like the push function (only you have to get the return value)

my @array = merge(@array2,$scalar);