fallintoplace opened a new pull request, #1416:
URL: https://github.com/apache/arrow-go/pull/1416

   ## What
   Speed up unaligned CopyBitmap and InvertBitmap ranges.
   
   ## Why
   The reader and writer paths process shifted ranges in small steps and 
allocate.
   
   ## Implementation
   - Use masks for partial bytes and bulk writes for aligned spans.
   - Decode shifted spans in 64-bit chunks.
   - Preserve overlap handling and add offset and aliasing coverage.
   
   ## Benchmark
   **5.35x geometric mean** across unaligned isolated cases. Non-overlapping 
cases drop from 1 alloc/op to 0.
   


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