anchor.diff:  -spec adler32(Z, Data) -> CheckSum when
         Z :: zstream(),
         Data :: iodata(),
  -      CheckSum :: integer().
  +      CheckSum :: non_neg_integer().
   adler32(Z, Data) when is_reference(Z) ->
       erlang:adler32(Data);
   adler32(_Z, _Data) ->
  
positive.code: -spec deflateSetDictionary(Z, Dictionary) -> Adler32 when
        Z :: zstream(),
        Dictionary :: iodata(),
        Adler32 :: integer().
  deflateSetDictionary(Z, Dictionary) ->
      deflateSetDictionary_nif(Z, Dictionary).
  deflateSetDictionary_nif(_Z, _Dictionary) ->
  
negative.code: %%
  %% %CopyrightBegin%
  %%
  %% Copyright Ericsson AB 2003-2018. All Rights Reserved.
  %%
  %% Licensed under the Apache License, Version 2.0 (the "License");
  %% you may not use this file except in compliance with the License.
  