## 2015-10-07, Version 4.2.0 'Argon' (Stable), @jasnell
### Notable changes
The first Node.js LTS release! See https://github.com/nodejs/LTS/ for details of the LTS process.
* **icu**: Updated to version 56 with significant performance improvements (Steven R. Loomis) [#3281](https://github.com/nodejs/node/pull/3281)
* **node**:
- Added new `-c` (or `--check`) command line argument for checking script syntax without executing the code (Dave Eddy) [#2411](https://github.com/nodejs/node/pull/2411)
- Added `process.versions.icu` to hold the current ICU library version (Evan Lucas) [#3102](https://github.com/nodejs/node/pull/3102)
- Added `process.release.lts` to hold the current LTS codename when the binary is from an active LTS release line (Rod Vagg) [#3212](https://github.com/nodejs/node/pull/3212)
* **npm**: Upgraded to npm 2.14.7 from 2.14.4, see [release notes](https://github.com/npm/npm/releases/tag/v2.14.7) for full details (Kat Marchán) [#3299](https://github.com/nodejs/node/pull/3299)
### Known issues
See https://github.com/nodejs/node/labels/confirmed-bug for complete and current list of known issues.
* Some problems with unreferenced timers running during `beforeExit` are still to be resolved. See [#1264](https://github.com/nodejs/node/issues/1264).
* Surrogate pair in REPL can freeze terminal. [#690](https://github.com/nodejs/node/issues/690)
* Calling `dns.setServers()` while a DNS query is in progress can cause the process to crash on a failed assertion. [#894](https://github.com/nodejs/node/issues/894)
* `url.resolve` may transfer the auth portion of the url when resolving between two full hosts, see [#1435](https://github.com/nodejs/node/issues/1435).
### Commits
* [[`8383c4fe00`](https://github.com/nodejs/node/commit/8383c4fe00)] - **assert**: support arrow functions in .throws() (Ben Noordhuis) [#3276](https://github.com/nodejs/node/pull/3276)
* [[`660f7591c8`](https://github.com/nodejs/node/commit/660f7591c8)] - **buffer**: FreeCallback should be tied to ArrayBuffer (Fedor Indutny) [#3198](https://github.com/nodejs/node/pull/3198)
* [[`651a5b51eb`](https://github.com/nodejs/node/commit/651a5b51eb)] - **buffer**: only check if instance is Uint8Array (Trevor Norris) [#3080](https://github.com/nodejs/node/pull/3080)
* [[`d5a1b1ad7c`](https://github.com/nodejs/node/commit/d5a1b1ad7c)] - **buffer**: clean up usage of __proto__ (Trevor Norris) [#3080](https://github.com/nodejs/node/pull/3080)
* [[`af24376e18`](https://github.com/nodejs/node/commit/af24376e18)] - **build**: Intl: deps: bump ICU to 56.1 (GA) (Steven R. Loomis) [#3281](https://github.com/nodejs/node/pull/3281)
* [[`d4fc6d93ef`](https://github.com/nodejs/node/commit/d4fc6d93ef)] - **doc**: add help repo link to CONTRIBUTING.md (Doug Shamoo) [#3233](https://github.com/nodejs/node/pull/3233)
* [[`725c7276dd`](https://github.com/nodejs/node/commit/725c7276dd)] - **doc**: fix README.md link to joyent/node intl wiki (Steven R. Loomis) [#3067](https://github.com/nodejs/node/pull/3067)
* [[`4a35ba4966`](https://github.com/nodejs/node/commit/4a35ba4966)] - **(SEMVER-MINOR)** **fs**: include filename in watch errors (charlierudolph) [#2748](https://github.com/nodejs/node/pull/2748)
* [[`2ddbbfd164`](https://github.com/nodejs/node/commit/2ddbbfd164)] - **http**: cork/uncork before flushing pipelined res (Fedor Indutny) [#3172](https://github.com/nodejs/node/pull/3172)
* [[`f638402e2f`](https://github.com/nodejs/node/commit/f638402e2f)] - **http**: add comment about `outputSize` in res/server (Fedor Indutny) [#3128](https://github.com/nodejs/node/pull/3128)
* [[`589287b2e3`](https://github.com/nodejs/node/commit/589287b2e3)] - **src**: convert BE-utf16-string to LE before search (Karl Skomski) [#3295](https://github.com/nodejs/node/pull/3295)
* [[`2314378f06`](https://github.com/nodejs/node/commit/2314378f06)] - **src**: fix u-a-free if uv returns err in ASYNC_CALL (Karl Skomski) [#3049](https://github.com/nodejs/node/pull/3049)
* [[`5ca4f6f8bd`](https://github.com/nodejs/node/commit/5ca4f6f8bd)] - **test**: test `util` rather than `common` (Rich Trott) [#3256](https://github.com/nodejs/node/pull/3256)
* [[`7a5ae34345`](https://github.com/nodejs/node/commit/7a5ae34345)] - **test**: refresh temp directory when using pipe (Rich Trott) [#3231](https://github.com/nodejs/node/pull/3231)