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my $r = timethese(
    -5,
...
);

cmpthese $r;

Benchmark: running enum, list for at least 5 CPU seconds...
      enum:  5 wallclock secs ( 3.55 usr +  1.74 sys =  5.29 CPU) @ 50
+1.89/s (n=2655)
...
enum  502/s   -- -70%
list 1668/s 232%   --