Interesting, there must be Perl differences too. The spread is not as great with Active State Perl v5.8.7. In particular, Better is not as much better.
Rate Greedy Sep Death_star Non Be
+tter
Greedy 9965/s -- -90% -94% -94%
+-97%
Sep 102700/s 931% -- -34% -37%
+-66%
Death_star 155342/s 1459% 51% -- -5%
+-48%
Non 164099/s 1547% 60% 6% --
+-46%
Better 301485/s 2925% 194% 94% 84%
+ --
The results above used OP's benchmark code (with the addition of Better).
Perl is Huffman encoded by design.
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