为什么在Lua（cocos2d-x）中需要返回布尔值？

我打印了require("Square")，但它返回了true，并且我得到了一个attempt to index local 'r'错误，为什么它没有返回一个cc.Scene？如何处理这个问题？

Square.lua

require "Cocos2d"
require "Cocos2dConstants"

local Square = class("Square", function()
    return cc.Scene:create()
end)

function Square.create()
    local square = Square.new()

    return square
end

function Square:ctor()
    self.visibleSize = cc.Director:getInstance():getVisibleSize()
    self.x = cc.Director:getInstance():getVisibleOrigin().x
    self.y = cc.Director:getInstance():getVisibleOrigin().y
    self.schedulerID = nil
end

在其他文件中调用 Square.lua

local r = require("Square")
local square = r.create()
print("square = "..string.format("%s",square))