When using Response.json(), server returns with "response.headers.toJSON is not a function"

[maplefluff]

Using node v20.10.0, using Response.json() will make the server return with "response.headers.toJSON is not a function".
I'm using elysia "v1.0.16" and elysia-polyfills "v0.6.4". I'm assuming this is to do with the pollyfills since if i use elysia with something like cloudflare workers where the polyfills arent needed, it works fine

As a little test i used this

new Elysia()
	.get("/one", new Response("test"))
	.get("/two", Response.json({ message: "test" }))
	.get("/three", { message: "test" })
	.get("/four", "test")
	.listen(5000);

going to everything except for "/two" returns how it should