anchor.diff:  -export([
       init/1,
       is_bool/2,
  +    is_integer/2,
       print_r/2,
       print_r/3,
       isset/2,
  
positive.code: is_bool(_Context, _Value) -> 
      false.
  
  
  -spec print_r(Context :: context(), Value :: var_value()) -> boolean().
  
  
negative.code: 
  init(Context) ->
      Funcs = [
          is_bool, is_integer, print_r, isset, empty, gettype, unset
      ],
      lists:foreach(fun(Func) ->
          Name = atom_to_binary(Func, utf8),
  