Exit code is 13

[nickserv]

Expected exit code 0, but actually received:

13 Unfinished Top-Level Await: await was used outside of a function in the top-level code, but the passed Promise never resolved.

https://nodejs.org/api/process.html#exit-codes

[nickserv]

This is happening again as of 10411fc. I think the ReadableStream's error handling is tripping and not closing the controller.