agent.getTimeline with cursor "..." produces 500 error

[boly38]

Describe the bug

Trying to follow the doc, I encounter a (minor) bug from api getTimeline : a backend 500 error
This issue is described here for the doc side : bluesky-social/bsky-docs#146
As this is a 500, I think the backend is not doing enough input validation on cursor query param

To Reproduce

Steps to reproduce the behavior:

(using api, node agent example)

const { data } = await agent.getTimeline({
  cursor: "...",
  limit: 30,
});

Expected behavior

I expect a 4xx result

Details

• node client "@atproto/api": "^0.12.10",
• use https://bsky.social as agent service (backend spcification)

Additional context

(issue first created by error on bluesky-social/social-app#4095)