Returning generics with `T<X, Y>`

Below, I have a generic list that uses fluid interface to return itself for some methods:

--- @class List
local List = {}

--- @generic T : List, V, _
--- @param self T<V, _>
--- @param value V         # Element value to insert
--- @return T<V, _>        # Returning itself (a generic)
function List:insert(value)
    return self           -- Returning itself (a generic)
end

-- test
---@type List<number, nil>
local mylist

local testingType = mylist:insert(1)
-- ^ Testing type is not `List<number, nil>` but literally `T<V, _>`

Expected behavior
testingType is of type List<number, nil>

I am thinking that this case could be something to look at for the 3.0 update.

(Edit: perfect #1000th issue...)

payload 未指出來源檔案或測試。首先重現提供的 List:insert 範例，並將推斷出的型別與預期的 List<number, nil> 進行比較；接著追蹤泛型回傳型別推斷，並新增一個回歸測試，確認結果不再是字面值 T<V, _>。