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sub splice_unique2 {
    my @sorted = sort qw{q w e r t y q w e r t y};
...
        }
    }
}

                   Rate splice_unique2 splice_unique  shift_unique    
+map_unique
splice_unique2  83836/s             --          -10%          -15%    
+      -28%
splice_unique   92839/s            11%            --           -6%    
+      -20%
shift_unique    99211/s            18%            7%            --    
+      -14%
map_unique     115924/s            38%           25%           17%    
+        --