vararg overload issue

If you have a function which takes in only a vararg and you only overload it, the input type is as expected just each of the overloads:

---@overload fun(param1: "test", param2: string)
---@overload fun(param1: "test2", param2: number)
---@overload fun(param1: "test3", param2: boolean, param3: number)
local function test(...)
end

test()

However, if you have a param before the vararg, the input type always becomes param, ...any:

---@overload fun(param1: "test", param2: string)
---@overload fun(param1: "test2", param2: number)
---@overload fun(param1: "test3", param2: boolean, param3: number)
local function test(param1, ...)
end

test()

Start by reproducing both annotated Lua examples from the issue and compare the inferred signatures for the two vararg forms. Trace the overload and vararg type-handling entry points, then verify that the parameter-before-vararg case preserves the overload-specific parameter types rather than collapsing to ...any.