Major platform additions and compatibility jumps
Bun.TOML rewrite — Bun replaced its old TOML support with a spec-exact v1.1.0 parser and added Bun.TOML.stringify(), making config handling substantially more capable and standards-aligned.
node:sqlite is now fully implemented — Bun added the node:sqlite module, wired it into build/shutdown/docs, and brought in the Node v26.3.0 test suite plus backup/session APIs.
Node-API parity expanded further — The week brought a large batch of N-API fixes and new exports, including better pending-exception behavior, coercion semantics, and additional v26 experimental symbols.
HTTP, streams, and server behavior got materially more Node-like
HTTP server and client correctness fixes — Bun fixed keep-alive detach/finish handling, close-delimited responses, HTTP/1.0 chunking, duplicate Date headers, and large res.write() buffering behavior to better match Node and avoid real server regressions.
Web Streams, zlib, and Readable.fromWeb() compatibility — Stream cancellation now propagates correctly, permessage-deflate recovers after stream end, and compression paths picked up dictionary support plus tighter reset behavior.
node:test and process lifecycle behavior improved — TestContext.mock now works, expectation diffs preserve literal text, and beforeExit no longer fires after fatal uncaught exceptions.
Correctness, safety, and lifetime bugs were heavily hardened
GC/UAF fixes across Redis, HTTP/2, TLS, and addons — Several high-risk lifetime issues were closed, including a Redis refcount over-release, HTTP final-result double delivery, HTTP/2 callback lifetimes, TLS wrapper rooting, and a worker teardown TSFN use-after-free.
Parser/resolver/compiler fixes — Bun fixed TypeScript newline parsing, side-effect-preserving expression folding, resolver cache races, HTML entry chunk generation under code splitting, and a crashy Mach-O compile/template path.
Socket, buffer, and path edge cases — The week also fixed keep-alive semantics, long Unix socket paths, buffer size handling past 2^32, mmap offset correctness, and several router/query parsing edge cases.
Other misc changes
Miscellaneous compatibility and maintenance — Additional fixes landed for MySQL/Postgres protocol validation, cron/date bounds, bun install tarball retries, bun:test and Node suite syncs, Windows/macOS-specific issues, docs updates, and assorted test hardening.