Fengzdadi opened a new pull request, #108:
URL: https://github.com/apache/datasketches-go/pull/108

   ## Summary
   - add VarOptItemsSketch implementation (variance-optimal weighted sampling)
   - add VarOpt serialization/deserialization support
   - add VarOpt unit tests
   
   ## Changes
   - core sketch implementation and update logic
   - serde preamble/flags encoding and decoding
   - tests covering warmup/estimation, invalid weights, and cumulative weight 
property
   
   ref: #98 PR2
   


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