jaideeppyne opened a new pull request, #183:
URL: https://github.com/apache/datasketches-go/pull/183

   ## Summary
   
   - Copy the stored min/max from the other digest in `Double.Merge` before 
compressing the combined centroid list.
   - Add a regression that merges a digest constructed with weighted tail 
centroids whose means are not the true extrema.
   
   ## Why
   
   `Merge` previously re-derived extrema from the extreme centroid means. That 
is exact only when those centroids have unit weight. Deserialized images can 
have weighted tails, so min/max drifted inward and rank/quantile tail 
interpolation used the wrong endpoints.
   
   Same defect as apache/datasketches-rust#277.
   
   ## Validation
   
   - `go test ./tdigest -run TestDouble_Merge`


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