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S&P 500 Index futures are down 0.5% as of 7:39 a.m. in New York, set to notch a monthly loss.
，这一点在91视频中也有详细论述
03 “世界模型”是终极进化方向？VR普及后，AI模型必将进军3D场景通过分析Seedance 2.0所展现出的优势与不足，我们已经可以在一定程度上勾勒出AI视频模型下一阶段的演进蓝图。未来的竞争，或将不再仅仅是生成更清晰、更逼真的画面，而是构建一个更懂物理、更懂叙事的“世界模型”。
Instead of tee() with its hidden unbounded buffer, you get explicit multi-consumer primitives. Stream.share() is pull-based: consumers pull from a shared source, and you configure the buffer limits and backpressure policy upfront.
Git packfiles use delta compression, storing only the diff when a 10MB file changes by one line, while the objects table stores each version in full. A file modified 100 times takes about 1GB in Postgres versus maybe 50MB in a packfile. Postgres does TOAST and compress large values, but that’s compressing individual objects in isolation, not delta-compressing across versions the way packfiles do, so the storage overhead is real. A delta-compression layer that periodically repacks objects within Postgres, or offloads large blobs to S3 the way LFS does, is a natural next step. For most repositories it still won’t matter since the median repo is small and disk is cheap, and GitHub’s Spokes system made a similar trade-off years ago, storing three full uncompressed copies of every repository across data centres because redundancy and operational simplicity beat storage efficiency even at hundreds of exabytes.