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               s/iter      BrowserUK packed_default        SortKey
BrowserUK        71.7             --           -66%           -79%
packed_default   24.5           193%             --           -38%
SortKey          15.2           372%            61%             --

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use Memchmark qw(cmpthese);

...
test: BrowserUK, memory used: 102006784 bytes
test: SortKey, memory used: 85598208 bytes
test: packed_default, memory used: 182788096 bytes