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## Summary - Updates oven-sh/mimalloc bun-dev3 branch to latest upstream microsoft/mimalloc dev3 (ffa38ab8) - Merged 12 new commits from upstream ### Key upstream changes included: - fix re-initialization of threads on macOS - add lock for sub-pagemap allocations - fix peak commit stat - fix use of continue in bitmap find_and_clear (fixes rare case of not finding space while it exists) ## Test plan - [ ] CI passes - [ ] Memory allocation tests pass 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>