[Bug] Unexpected result when fetcher returns false

[AngusFu]

Description

Always suspending when the fetcher returns (strictly, "resolved with") false.

async function fetcher() {
  return false;
}

async function fetcher2() {
  return true;
}

function Demo() {
  const { data: ok } = useSWR("/api", fetcher, { suspense: true });
  return <h1>{ok ? "Ok" : "Not ok"}</h1>;
}

function Demo2() {
  const { data: ok } = useSWR("/api2", fetcher2, { suspense: true });
  return <h1>{ok ? "Ok" : "Not ok"}</h1>;
}

<>
    <Suspense fallback={<h1>loading...</h1>}>
    <Demo />
    </Suspense>
    <Suspense fallback={<h1>loading...</h1>}>
    <Demo2 />
    </Suspense>
</>

Way to reproduce

See the codesandbox demo:

https://codesandbox.io/s/loving-grass-pv9ey

[AngusFu]

PS: Seems falsy values in JavaScript ("" false 0) would get the above result, which is unexpected.

[shuding]

Thanks for reporting! Will get this fixed soon.