abacef commented on PR #7819:
URL: https://github.com/apache/arrow-rs/pull/7819#issuecomment-3017191018

   I am seeing the time about cut in half
   `cargo bench --bench json_writer_coerce_primitive`
   ```
   f64_rows                time:   [4.7327 ms 4.8176 ms 4.9280 ms]
                           change: [−61.878% −61.081% −60.120%] (p = 0.00 < 
0.05)
                           Performance has improved.
   
   f32_rows                time:   [3.0712 ms 3.1112 ms 3.1661 ms]
                           change: [−44.925% −43.676% −42.438%] (p = 0.00 < 
0.05)
                           Performance has improved.
   
   i64_rows                time:   [3.8781 ms 3.9195 ms 3.9665 ms]
                           change: [−47.707% −46.591% −45.626%] (p = 0.00 < 
0.05)
                           Performance has improved.
   
   i32_rows                time:   [3.5450 ms 3.5870 ms 3.6408 ms]
                           change: [−48.915% −47.916% −46.916%] (p = 0.00 < 
0.05)
                           Performance has improved.
   
   mixed_rows              time:   [15.824 ms 15.994 ms 16.196 ms]
                           change: [−49.339% −48.584% −47.802%] (p = 0.00 < 
0.05)
                           Performance has improved.
   
   ```


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