# Fireside 0.1.0-next.4 release notes

> Fireside 0.1.0-next.4, 11 September 2026: Phase A–F qualified engine. Engine changes since next.3 cover the Phase A–E work: developer-tool inspection and…

Phase A–F qualified engine. Published on 11 September 2026, as a preview.

[Every release](https://firenook.dev/changelog)

Published as `@fireside-dev/cli`, before Firenook’s rename. [About the former name](https://firenook.dev/docs/help/former-name).

A newer release is out: [Firenook 0.2.0](https://firenook.dev/changelog/0.2.0), the first release for public use.

## What changed

The changes, as the release notes give them.

1. Engine changes since next.3 cover the Phase A–E work: developer-tool inspection and request tracing, rules coverage, Functions readiness and reload contracts, state upgrade, low-disk and interrupted-export recovery, REST read projection/transaction semantics, canonical REST value/timestamp encoding, and cheaper nested-value serialization.

## Known limits

What this release was known not to do yet, as its notes recorded it.

- Known limitations recorded with this release: under one consumer's concurrent two-hour workload, a limit-1 collection query and a 64 KiB Storage cycle had higher medians than the official emulator, while idle and light-load medians were at parity or better; Storage mutations pay an fsync by design; fresh-start import of a large dataset is slower than the Java in-memory import. Persistent-dataset resume was not measured in that run.

## How it was checked

The source it was built from, the runs it passed, and how it was published.

- Pin the engine to `fc54e341a6da4fc6ca26849287f92f335a6184ce`, the candidate that passed exact-source CI, all five platform install cells and a representative private consumer's full-data endurance, restart, parity and fresh-setup acceptance. See `support/phase-f-qualification.md`.
- No dependency version, toolchain or package layout change. Prerelease on `next`; no stable or universal-compatibility claim.

[The release on GitHub](https://github.com/firenook-dev/firenook/releases/tag/npm-v0.1.0-next.4).

## The latest is 0.2.0

The first release for public use. Install it, and read what changed on the way.

`npm install --save-dev firenook@0.2.0`

[Read the 0.2.0 notes](https://firenook.dev/changelog/0.2.0)