Discussions, summarized

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• Hacker News1Git 3.0's upcoming SHA-256 default will be a costly mistakeThe author argues Git 3.0's planned switch from SHA-1 to SHA-256 will be a costly, disruptive change with little real benefit, since collision attacks are impractical and trust in code comes from where you pull it, while real attacks rely on social engineering and compromised maintainers.Whether git hashes are a security feature:Commenters debate Linus's view that SHA-1 is only a consistency check. Many argue signed commits, pinned dependencies, submodules and CI depend on hash integrity, so collisions enable supply-chain attacks. Others say trust belongs elsewhere and attacks remain impractical.Migration pain and ecosystem compatibility:Many compare the SHA-256 switch to IPv6 or Python 3: no backward compatibility, unclear benefits and lagging tooling. Concerns include broken commit references, char[40] assumptions, forges and submodules. Others note Git's planned SHA-1/SHA-256 mapping should ease migration.Fossil's quick switch and hash agility:Fossil moved to SHA3-256 six days after SHAttered without breaking links. Commenters say Git's difficulty comes from its huge ecosystem, not technical limits. Others debate hash agility, weighing multihash-style flexibility against fixed algorithms that avoid downgrade risks.
• Reddit science1Unsafe sleep factors found in nearly 75% of sudden unexpected infant deaths, CDC saysA CDC report found 73% of 4,861 sudden infant deaths from 2020-2024 involved unsafe sleep factors like soft bedding and bed-sharing. Experts urge placing babies on their backs in empty cribs, room-sharing without bed-sharing, and avoiding smoke and substances.SIDS vs. suffocation labeling:Many say SIDS is often a gentle label for accidental suffocation to spare grieving parents. Others note SUID is the umbrella term and SIDS means a death left unexplained after investigation, sharing losses despite safe sleep and citing genetic causes.Co-sleeping risks and the Japan comparison:Some question co-sleeping risks, citing Japan's low SIDS rate and asking for socioeconomic controls. Replies point to firm futons, slimmer parents and different death coding. Some outline "safe co-sleeping" rules, while clinicians insist safe sleep has no downside.Parental support and sleep deprivation:Users argue US parents lack support, with no paid leave and costly childcare, leaving exhausted parents prone to unsafe choices. Strict guidelines are blamed for sleep loss and postpartum depression. Fixes suggested include free cribs, baby boxes and night nurses.
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