Improve documentation about passing errors

[vassbence]

Hi!

We should improve docs about when and where can/should one pass an Error to be correctly serialized, for example .error(new Error("test"))" and .info({err: new Error("test")}) works but .warn(new Error("test")) does not.

Would a dev be so kind as to list out all the possible variations? So that I can submit a PR and make it clear in the docs that when does pino serialize errors and when it not.

[mcollina]

What you listed is all of it! Thanks for offering to send a PR.

What's not working with .warn(new Error("test"))? This should work as expected (an error logged at the "Warn" level).

[vassbence]

Submitted the PR.

About .warn(): I think I just messed something up on my end, checked it again and passing errors works as expected.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.