docs: def all_without(self, x):
          """Returns all arguments not containing given string
             (or list thereof).
          """
  
          _args = []
  
          for arg in self.all:
              if _is_collection(x):
                  for _x in x:
                      if _x not in arg:
                          _args.append(arg)
                          break
              else:
                  if x not in arg:
                      _args.append(arg)
  
          return ArgsList(_args, no_argv=True)