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my $op = '+';
...
multi_add 5 elements:  2 wallclock secs ( 2.52 usr +  0.01 sys =  2.53
+ CPU) @ 395256.92/s (n=1000000)
    reduce:  4 wallclock secs ( 3.24 usr +  0.01 sys =  3.25 CPU) @ 30
+7692.31/s (n=1000000)

my $op = '+';
my $add_500_things = arbitrary_operator_maker($op, 500);
...
multi_add 5 elements:  0 wallclock secs ( 1.03 usr +  0.00 sys =  1.03
+ CPU) @ 9708.74/s (n=10000)
    reduce:  1 wallclock secs ( 1.18 usr +  0.00 sys =  1.18 CPU) @ 84
+74.58/s (n=10000)