Singleton type turns into a built-in type after passing through a function?

[nekxtari (durak1)]

I have a function that returns the received value without modifying anything. But when it receives a value of type "HI" (singleton), it converts it to a type string (built-in), which is different from "HI"!

--!strict

local function get(a)
	return a
end

local v: "HI" = get("HI") -- TypeError: Type 'string' could not be converted into '"HI"'

I need to get rid of this error. Is this a bug, or am I missing something?

Tried setting types explicitly, getting the same result:

--!strict

local function get<t>(a: t): t
	return a
end

local v: "HI" = get("HI") -- TypeError: Type 'string' could not be converted into '"HI"'

If you’re curious why is this neccessary, here’s the original issue that comes from this weird behavior.

[nekxtari (durak1)]

nevermind, found an answer on luau’s repo: [New Solver] Passing a string literal into a function reduces it to a `string` type · Issue #1790 · luau-lang/luau · GitHub