Perl sees your last line as
print( (@fred."\n") );
... that is, it first evaluates @fred . "\n" and then prints that result.
. evaluates its operands in scalar context. An array in scalar context evaluates to the number of its elements. Your expression then becomes
print( (scalar(@fred),"\n") );
... which is
print 10,"\n";
If you want to print an array, maybe put it in string context first:
print "@fred\n";
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