How to manage onAbort

I guess, managing onAbort is very important features in the production level. However, I coundn't find real working examples for this https://ai-sdk.dev/docs/advanced/stopping-streams#C2bcf146e-L8. steps are always [] which make me confusing how to manage partial messages as aborted by stop() on the client. It would be good to have onAbort example. (using v5 :))