数字预期，却得到布尔值

当我运行这段代码时，我得到了如下错误信息：

运行错误：
AI.lua:7: 第二个参数需要是数字，但得到了布尔值

我该怎么解决？我需要布尔值。

Anything = not nil
Nothing = not Anything
Everything = Anything and not Nothing
Overtaking = Anything and Nothing
God = Everything and Overtaking
Divinity = God and not not God
Better = debug.getlocal(1, Divinity)
x = ""
repeat
   i = 32
   repeat
      i = i + 1
      a = string.char(i)
      if Better == true then
          x = x .. a
      else x = x
      end
   until (i == 126)
until (x == x .. "")
print (x)