serve segfaults with async await fetch handler

[simylein]

What version of Bun is running?

1.0.29+a146856d1

What platform is your computer?

Darwin 23.3.0 arm64 arm

What steps can reproduce the bug?

import { serve, Serve, Server, sleep } from 'bun';

declare global {
	// eslint-disable-next-line no-var
	var server: Server;
}

const parseBody = async (request: Request): Promise<unknown | null> => {
	if (request.body) {
		const body = await request.json();
		return body;
	} else {
		return null;
	}
};

const bootstrap = (): Server => {
	const options: Serve = {
		port: 4000,
		development: true,
		async fetch(request: Request): Promise<Response> {
			await sleep(200 + Math.random() * 100);
			const body = await parseBody(request);
			return new Response(JSON.stringify(body));
		},
	};

	if (!global.server) {
		global.server = serve(options);
	} else {
		global.server.reload(options);
	}

	return global.server;
};

bootstrap();

curl localhost:4000 -d '{"hello":"world"}'

What is the expected behavior?

It should not segfault.

What do you see instead?

It segfaults with Segmentation fault: 11

Additional information

It starts working when excluding the sleep call or the parseBody one