• feat: supports top-level await and namespace isolation #750

When we solved #749, we added async wrapper by the way to support top-level await in the beta version.

But it looks like the async wrapper adds more latency than I had previously expected, so it should be optional.

We should revert the change:

• It should be disabled by default

• Perhaps it could be enabled via metadata like @async

• Or always expect users to use async wrappers themselves.

(async function () {
	/// userscript code
})();