• [12.x] add back return type by @browner12 in #56774
• fix: base class guard in return types is breaking custom guards by @phadaphunk in #56779
• [12.x] Standardise polyfill dependencies by @crynobone in #56781
• [12.x] Refactor duplicated logic in ReplacesAttributes by @AhmedAlaa4611 in #56790
• [12.x] Refactor duplicated logic in ReplacesAttributes by @AhmedAlaa4611 in #56789
• [12.x] Improve output grammar in ScheduleRunCommand by @cosmastech in #56776