Commits on Sep 14, 2021

1. Precompute encodeWithKeys buffer size to avoid resizes …

   This is strictly an optimization. Right now we always undersize the buffer then later increase it.
   This changes the code to accurately size it the first time to ensure we never re-allocate.
   
   ```
   name                old time/op    new time/op    delta
   RecordReqCommand-6    2.26µs ± 5%    2.10µs ± 5%   -7.39%  (p=0.000 n=10+10)
   RecordViaStats-6      2.70µs ± 5%    2.53µs ± 4%   -6.31%  (p=0.000 n=10+10)
   
   name                old alloc/op   new alloc/op   delta
   RecordReqCommand-6      426B ± 0%      384B ± 0%   -9.86%  (p=0.000 n=10+10)
   RecordViaStats-6        594B ± 0%      552B ± 0%   -7.07%  (p=0.000 n=10+10)
   
   name                old allocs/op  new allocs/op  delta
   RecordReqCommand-6      25.0 ± 0%      17.0 ± 0%  -32.00%  (p=0.000 n=10+10)
   RecordViaStats-6        28.0 ± 0%      20.0 ± 0%  -28.57%  (p=0.000 n=10+10)
   ```

   

   howardjohn committed Sep 14, 2021
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   f8d6079 View commit details

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