Index an enum-value table bug

[ChouUn]

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

expected the value type of mapping when index

Actual Behaviour

got an unknown

Reproduction steps

---@enum(key) AttrName
local o = {
    ['hp_max'] = true,
}
local map = {
    ['hp_max'] = 114514,
}
---@param t table<AttrName, number>
local function test(t)
    --[[
        Usage 1: correct
    ]]
    local a = 'hp_max'
    local b = t[a]  -- expected: number, got: number
    print(b)

    --[[
        Usage 2: incorrect
    ]]
    local c = t['hp_max'] -- expected: number, got: unknown
    print(c)

    --[[
        Usage 3: correct
    ]]
    local d = "hp_grow"
    local e = t[d] -- expected: unknown, got: unknown
    print(e)
end
test(map)

Additional Notes

No response

Log File

No response

[tomlau10]

similar issue: #2791

---

And as a bonus case for the code snippet above:

--[[
    Usage 4: incorrect
]]
local x
local y = t[x] -- expected: unknown, got: number

seems when using unknown key to index this table, it will incorrectly infer as number as well