False negative for param-type-mismatch when using a variable as argument

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

---@class (exact) Foo
---@field FooField integer
local Foo

---@param FooParam Foo
local function test(FooParam) end

local x = {z = 1}
test(x)

test({z = 1})

In the example above, Lua LS should report a param-type-mismatch diagnostic for test(x). It has enough information to know that x cannot be of type Foo, at the very least because it is missing FooField.
We see that test({z=1}) correctly reports the param-type-mismatch diagnostic.

Actual Behaviour

No error is reported.

Reproduction steps

In any editor with Lua LS installed, write the provided code. Observe that there are no squiggles reported.

Additional Notes

I would say this is a pretty serious bug. I would have expected Lua LS's type checking to be robust enough to handle checking the types of variables. It seems that all it is doing is checking that the type is a table.

IS this because there is no narrowing of variables once they become tables? This is only done for table literals?

Log File

No response

从 Lua LS 中提供的 Lua 复现开始，跟踪传递给 test 的参数的类型检查路径，将变量参数与表字面量进行比较。当针对 test(x) 报告相同的 param-type-mismatch 诊断时即表示完成，包括缺少 FooField 的情况。