@generic return ignores question mark

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Type Checking

Expected Behaviour

Type of y in example below is integer?

Actual Behaviour

Type of y in example below is integer

Reproduction steps

---@generic T
---@param test T
---@return T?
function Func(test)
end

--- @return integer?
function Func2()
end

local x = 0
local y = Func(x)
local z = Func2()

Additional Notes

T | nil works as a workaround.

Log File

No response

在 Visual Studio Code 扩展中复现 Lua 代码片段，并检查 y 和 z 的推断类型，将 T? 与 T | nil 解决方法进行比较。完成标准是泛型 @return T? 保留 nil，使 y 为 integer?，而现有的 Func2 结果仍为 integer?。