IMO lack of initialization in a language should be explicit, not implicit, e.g. DLang:

  import std.array : uninitializedArray;

  int a;                                   /+ defaults to '0' +/
  int b = void;                            /+ not initialized +/
  bool[5] c;                               /+ defaults to array of 'false' +/
  auto d = uninitializedArray!(bool[])(5); /+ not initialized +/