anchor.diff:              {EIsEncoded, ELevel} = enc_getopt_level(Level),
               EKey     = enc_getopt_key(Level, Key, Domain, Type, Protocol),
               %% We may need to decode the value (for the same reason
  -            %% we needed to encode the value for setopt).
  +            %% we (may have) needed to encode the value for setopt).
               case nif_getopt(SockRef, EIsEncoded, ELevel, EKey) of
                   ok ->
                       ok;
  
positive.code: enc_sockopt_key(Level, {NativeOpt, ValueSize} = Opt, get = _Dir, _D, _T, _P)
    when is_integer(Level) andalso
         is_integer(NativeOpt) andalso
         is_integer(ValueSize) andalso (ValueSize >= 0) ->
      Opt;
  
  enc_sockopt_key(Level, Opt, _Dir, _Domain, _Type, _Protocol) ->
  
negative.code:       Level     :: integer(),
        Key       :: {NativeOpt, ValueSize},
        NativeOpt :: integer(),
        ValueSize :: int | bool | non_neg_integer(),
        Value     :: term(),
        Reason    :: term().
  
  