daescha opened a new pull request, #203:
URL: https://github.com/apache/datasketches-go/pull/203

   Make `NewHllSketchFromSlice` return an error instead of panicking on 
malformed input.
   
   - `checkPreamble` now rejects unknown modes, unknown target HLL types and 
lgK outside 4..21.
   - The list, hash set, aux map and HLL array decoders check their counts and 
array sizes against the slice length.
   - `TestDeserializeCorruptBytes` covers two fuzz-found inputs, one bad-mode 
and one bad-lgK preamble, and every prefix of 8 bytes or more of compact and 
updatable HLL4/6/8 sketches.


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