Can you explain me this module

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#1 
local data = {} 
 
  function data:__call(t) 
  assert(type(t) == "table", ("bad arg #1 table expected, got %s"):format(type(t)))  

  local t2 = t

  local bindable = Instance.new("BindableEvent")
  t = setmetatable({}, { 
      __index = t,
      __newindex = function(self, index, value)
      if t2[index] ~= value then
      bindable:Fire(index, value) 
      rawset(t2, index, value) -- C stack overflow no more
      end
  end
  })

   t.Changed = bindable.Event  
     return t
  end

  return setmetatable(data, data)

How __newindex can detect self[index] += value
When I try it myself it gives me a error but this module is working but how?
Can you explain me please

1 Like
#2

Okay I understand now __index can detect self[key] += val I didn’t know that