The above solutions rely on interpreting the hash in a list context, in which it returns all its key value pairs flattened out. for eg, see the below code

use strict ;
use warnings ;
my %hash=('a'=>'b','c'=>'d') ;
my @arr=(%hash) ;
local $"="|" ;
print "@arr" ;
[download]

which spews out

a|b|c|d
[download]

Now,

(%hash,'e'=>'f')
[download]

flattens out the key value pairs of %hash into a list. Hence it reduces to

('a'=>'b','c'=>'d','e'=>'f')
[download]

So on and so forth for code like

(%hash1,%hash2)
[download]