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Git 3.0 to default to SHA-256 hashes, requiring tooling audits

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The upcoming Git 3.0 release will change the default object format from SHA-1 to SHA-256. This will increase the length of a full commit hash from 40 to 64 hexadecimal characters. Many existing tools, such as CI scripts, database schemas, and internal APIs, may fail because they hardcode assumptions about the 40-character hash length. Developers are advised to audit their systems using SHA-256 test repositories to identify potential breakages before the update.

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