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C:\test>1036622 -N=1e3
                  Rate grep build_new_array offset_copy for_splice edi
+t_in_place
...
offset_copy       1.14      6737%  22%              6%          --    
+      -24%
edit_in_place    0.868      8884%  60%             39%         31%    
+        --

:
#! perl -slw
use strict;
...
    ],
};

C:\test>1036622 -N=1e3
                  Rate grep build_new_array offset_copy edit_in_place 
+for_splice
...
edit_in_place   5.26/s 229%            155%         60%            -- 
+       -4%
for_splice      5.49/s 243%            166%         67%            4% 
+        --