Recapping the London Mercurial sprint

The Mercurial development team held a 3-day sprint in London hosted by Jane Street, gathering nearly 20 contributors. Key topics included: a FUSE-based Virtual File System that reduced working copy initialization from 20s+ to under 2s; first-class conflict handling inspired by Pijul and Jujutsu; a new 'Hyperlog' storage format (revlog V2) with mutable index entries, unified filelogs, and better transactionality; 'store shapes' as a replacement for the brittle narrow extension; scaling improvements for obsmarker exchange and bundle caching; Changeset Evolution discussions with GitButler; and plans for Mercurial to act as a high-performance Git server. Multiple bug fixes, documentation updates, and Heptapod releases were also shipped during the sprint.

Source: https://mercurial-scm.org/news/2026/0005-london-sprint-recap. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.