The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
The practical implication: a string like “аpple.com” with Cyrillic а (U+0430) is pixel-identical to “apple.com” in 40+ fonts. The user, the browser’s address bar, and any visual review process all see the same pixels. This is not theoretical. It is a measured property of the font files shipping on every Mac.
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Москвичей предупредили о резком похолодании09:45，推荐阅读搜狗输入法2026获取更多信息
{"user_content": "make it red", "tool_name": "change_background_color", "tool_arguments": "{\"color\": \"red\"}"}