The review for SE-0372: Document Sorting as Stable ran from September 7th to September 20th. The language workgroup has decided to accept the proposal.
Feedback was almost universally positive on formally documenting this guarantee in the standard library. There was some discussion about whether guaranteeing a stable sort is the right priority versus offering a compositional comparison API for sorting. The language workgroup agrees that such an API is worth exploring in the future but that a stable sort guarantee is valuable on its own.
Thank you to everyone who participated in the review!