s2: Improve better compression #359
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Index more entries at beginning and end of matches. Before/after: ``` Reading d:\compress\enwik9... Compressing... 1000000000 -> 426242923 [42.62%]; 225ms, 4244.2MB/s Compressing... 1000000000 -> 418428483 [41.84%]; 230ms, 4154.8MB/s Reading d:\compress\adresser.json... Compressing... 7983034785 -> 457984083 [5.74%]; 507ms, 15018.9MB/s Compressing... 7983034785 -> 453666648 [5.68%]; 494ms, 15424.7MB/s Reading d:\compress\nyc-taxi-data-10M.csv... Compressing... 3325605752 -> 935022950 [28.12%]; 462ms, 6870.2MB/s Compressing... 3325605752 -> 917905514 [27.60%]; 460ms, 6889.8MB/s ```
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Index more entries at beginning and end of matches.
Before/after: