Enum created with `@alias` breaks when unioned with table

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Type Checking

Expected Behaviour

it should allow either the enum or a table

Actual Behaviour

Cannot assign `integer` to parameter ``BAR`|`FOO`|any[]`.
- `integer` cannot match ``BAR`|`FOO`|any[]`
- Type `integer` cannot match `any[]`
- Type `number` cannot match `any[]`

Reproduction steps

FOO = 1
BAR = 2

--- @alias WAT `FOO` | `BAR`
--- @param a WAT | any[]
local function aa(a) end

aa(FOO)

Additional Notes

Bonus: If you change the type to WAT | WAT[] the error message is

Cannot assign `integer` to parameter ``BAR`|`BAR`|`FOO`[]|`FOO``.
- `integer` cannot match ``BAR`|`BAR`|`FOO`[]|`FOO``
- Type `integer` cannot match ``BAR`|`FOO`[]`
- Type `number` cannot match ``BAR`|`FOO`[]`

which looks very visually confusing

Log File

No response

在 Visual Studio Code 扩展中复现报告的 Lua 代码，并检查将别名与联合类型和表结合时的类型检查路径。当 aa(FOO) 对 WAT | any[] 被接受，并且对于 WAT | WAT[] 情况产生的类型诊断不再令人困惑时，即表示完成。