Re: The behavior when assigning an array to scalar?

[choroba]

That's because the comma operator in scalar context returns the second argument. See perlop for details.

Update:

Also, one interesting case is missing in your question:

my $t = '111', '222', 'aaa', 'bbb';
print $t;

It prints 111, becuase of precedence of the two operators involved, the comma and equal sign. In fact, the parentheses in the $s case were used only to change the precedence.