Block the final user on its cached resource's `__aexit__()` and raise regular cleanup errors at that user's ctx boundary. Deats, - serialize user registration and teardown under each cache-key lock - keep queued entrants on the same lock through resource replacement - preserve `Cancelled`, `KeyboardInterrupt`, and `SystemExit` flow - cover successful, failing, cancelled, and re-entry teardown paths Prompt-IO: ai/prompt-io/opencode/20260804T030309Z_65bf9df5_prompt_io.md (this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`)) |
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