{"id":"macos-fsync-weaker-than-implied","text":"The codebase uses `os.fsync()` exclusively, which on macOS/APFS does not flush the disk write cache; true durability requires `fcntl(fd, F_FULLFSYNC)` which is never used anywhere","truth_value":"IN","source":"entries/2026/05/29/topic-shadow-paging-or-steal-no-force.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"macos-fsync-weaker-than-implied","truth_value":"IN","reason":"premise"}]}}