Best of Theo - t3․gg — August 2025

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   Theo - t3․gg·41w

   Things aren’t looking good for GitHub…

   GitHub's CEO Thomas Dohmke has stepped down, and the platform is now being integrated directly into Microsoft's Core AI organization, ending its independent operation. This shift raises concerns about GitHub's future direction, as Microsoft appears to be prioritizing AI features over core platform improvements. The author argues that GitHub has been coasting on legacy sentiment while competitors like Graphite offer better developer experiences. With GitHub now reporting to an AI-focused team, there are worries that non-AI features will be deprioritized, and the platform may not be well-positioned for the future of AI-assisted development.

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   Git is holding us back

   Git has fundamental limitations that become more apparent with AI-assisted development. The article argues that Git's commit-based workflow, designed for email-based collaboration, doesn't suit modern needs where developers work with AI agents and need finer-grained version control. Zed IDE is developing Delta DB, an operation-based version control system that tracks every edit and maintains context between commits, aiming to create a more collaborative workspace for humans and AI agents working together.

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   Theo - t3․gg·41w

   JSON just got way better (yes really)

   Chrome's V8 engine has dramatically improved JSON.stringify performance by up to 3x through several optimizations: a new side-effect-free fast path that bypasses expensive checks, specialized string handling for one-byte vs two-byte characters, SIMD instructions for escape character detection, hidden class caching for repeated object shapes, segmented buffer allocation to eliminate copying overhead, and upgrading to the DragonBox algorithm for number-to-string conversion. These improvements are available in Chrome 138 and benefit most common JSON serialization use cases automatically.

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   Theo - t3․gg·40w

   OpenAI just dropped a Cursor competitor?

   OpenAI launched Codex, a comprehensive AI coding platform that competes with Cursor by offering IDE extensions, cloud-to-local environment switching, GitHub code review integration, and a rebuilt CLI in Rust. The service works across multiple editors (VS Code, Cursor, WindSurf) and includes background agents that can file pull requests automatically. Testing shows it can successfully build complete applications like an AI image generator with database persistence, though the UI has various bugs and the cloud-to-PR workflow has reliability issues. The platform offers different usage tiers ($20-200/month) with varying message limits, positioning itself as an all-in-one solution for developers already using ChatGPT.

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