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docs(changelog): release notes for 4.0.0-beta.2

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<a name="4.0.0-beta.2"></a>
# [4.0.0-beta.2](https://github.com/angular/angular/compare/4.0.0-beta.1...4.0.0-beta.2) (2017-01-06)
### Features
* **compiler:** generate less code for bindings to DOM elements ([db49d42](https://github.com/angular/angular/commit/db49d42))
* **compiler:** generate proper reexports in `.ngfactory.ts` files to not need transitive deps for compiling `.ngfactory.ts` files. ([#13524](https://github.com/angular/angular/issues/13524)) ([9c69703](https://github.com/angular/angular/commit/9c69703)), closes [#12787](https://github.com/angular/angular/issues/12787)
* **router:** add an extra argument to CanDeactivate interface ([#13560](https://github.com/angular/angular/issues/13560)) ([69fa3bb](https://github.com/angular/angular/commit/69fa3bb)), closes [#9853](https://github.com/angular/angular/issues/9853)
### Bug Fixes
* **common:** improve error message by adding a link to trackBy docs ([#13634](https://github.com/angular/angular/issues/13634)) ([6976903](https://github.com/angular/angular/commit/6976903))
* **common:** do not override locale provided on bootstrap ([#13654](https://github.com/angular/angular/issues/13654)) ([2dd6280](https://github.com/angular/angular/commit/2dd6280)), closes [#13607](https://github.com/angular/angular/issues/13607)
* **common:** allow null/undefined values for `NgForTrackBy` ([f88cd2f](https://github.com/angular/angular/commit/f88cd2f)), closes [#13641](https://github.com/angular/angular/issues/13641)
* **compiler:** don’t throw when using `ANALYZE_FOR_ENTRY_COMPONENTS` with user classes ([#13679](https://github.com/angular/angular/issues/13679)) ([7690d02](https://github.com/angular/angular/commit/7690d02)), closes [#13565](https://github.com/angular/angular/issues/13565)
* **compiler:** improve error message for undefined providers ([#13546](https://github.com/angular/angular/issues/13546)) ([6b02b80](https://github.com/angular/angular/commit/6b02b80)), closes [#10835](https://github.com/angular/angular/issues/10835)
* **compiler:** improve the error when template is not a string ([2c0c86e](https://github.com/angular/angular/commit/2c0c86e)), closes [#8708](https://github.com/angular/angular/issues/8708) [#13377](https://github.com/angular/angular/issues/13377)
* **compiler:** query `<template>` elements before their children. ([#13677](https://github.com/angular/angular/issues/13677)) ([7c21064](https://github.com/angular/angular/commit/7c21064)), closes [#13118](https://github.com/angular/angular/issues/13118) [#13167](https://github.com/angular/angular/issues/13167)
* **compiler:** throw an error for invalid provider ([#13544](https://github.com/angular/angular/issues/13544)) ([445ed43](https://github.com/angular/angular/commit/445ed43)), closes [#8870](https://github.com/angular/angular/issues/8870)
* **compiler:** allow "." in attribute selectors ([#13653](https://github.com/angular/angular/issues/13653)) ([881eb89](https://github.com/angular/angular/commit/881eb89)), closes [#13645](https://github.com/angular/angular/issues/13645)
* **core:** animations no longer silently exits if the element is not apart of the DOM ([#13763](https://github.com/angular/angular/issues/13763)) ([21030e9](https://github.com/angular/angular/commit/21030e9))
* **core:** animations should blend in all previously transitioned styles into next animation if interrupted ([#13148](https://github.com/angular/angular/issues/13148)) ([889b48d](https://github.com/angular/angular/commit/889b48d))
* **core:** remove reference to "Angular 2" in dev mode warning ([#13751](https://github.com/angular/angular/issues/13751)) ([c5c53f3](https://github.com/angular/angular/commit/c5c53f3))
* **forms:** Validators.required properly validate arrays ([#13362](https://github.com/angular/angular/issues/13362)) ([9898d8f](https://github.com/angular/angular/commit/9898d8f)), closes [#12274](https://github.com/angular/angular/issues/12274)
* **i18n:** parse ICU messages while normalizing templates ([e74d8aa](https://github.com/angular/angular/commit/e74d8aa))
* **language-service:** support TypeScript 2.1 ([#13655](https://github.com/angular/angular/issues/13655)) ([8063b0d](https://github.com/angular/angular/commit/8063b0d))
* **router:** fix lazy loaded module with wildcard route ([#13649](https://github.com/angular/angular/issues/13649)) ([0eca960](https://github.com/angular/angular/commit/0eca960)), closes [#12955](https://github.com/angular/angular/issues/12955)
* **router:** routerLink support of null ([#13380](https://github.com/angular/angular/issues/13380)) ([174334d](https://github.com/angular/angular/commit/174334d)), closes [#6971](https://github.com/angular/angular/issues/6971)
* **router:** update route snapshot before emit new values ([#13558](https://github.com/angular/angular/issues/13558)) ([07e0fce](https://github.com/angular/angular/commit/07e0fce)), closes [#12912](https://github.com/angular/angular/issues/12912)
* **testing:** improve misleading error message when don't call compileComponents ([#13543](https://github.com/angular/angular/issues/13543)) ([67380d4](https://github.com/angular/angular/commit/67380d4)), closes [#11301](https://github.com/angular/angular/issues/11301)
* **upgrade:** fix/improve support for lifecycle hooks ([#13020](https://github.com/angular/angular/issues/13020)) ([e5c4e58](https://github.com/angular/angular/commit/e5c4e58))
### BREAKING CHANGES
* **core**: `SimpleChange` now takes an additional argument that defines whether this is the first
change or not. This is a low profile API and we don't expect anyone to be affected by this change.
If you are impacted by this change please file an issue. ([465516b](https://github.com/angular/angular/commit/465516b))
<a name="4.0.0-beta.1"></a> <a name="4.0.0-beta.1"></a>
# [4.0.0-beta.1](https://github.com/angular/angular/compare/2.4.0-marker...4.0.0-beta.1) (2016-12-22) # [4.0.0-beta.1](https://github.com/angular/angular/compare/2.4.0-marker...4.0.0-beta.1) (2016-12-22)
@ -104,10 +147,10 @@ Note: 4.0.0-beta.0 release also contains all the changes present in the 2.3.1 re
### Note ### ### Note ###
Due to regression in the 2.3.0 release that was fixed by [#13464](https://github.com/angular/angular/pull/13464), Due to regression in the 2.3.0 release that was fixed by [#13464](https://github.com/angular/angular/pull/13464),
components that have been compiled using 2.3.0 and published to npm will need to be recompiled and republished. components that have been compiled using 2.3.0 and published to npm will need to be recompiled and republished.
The >=2.3.1 compiler will issue is the following error if it encounters components compiled with 2.3.0: The >=2.3.1 compiler will issue is the following error if it encounters components compiled with 2.3.0:
`Unsupported metadata version 2 for module ${module}. This module should be compiled with a newer version of ngc`. `Unsupported metadata version 2 for module ${module}. This module should be compiled with a newer version of ngc`.
We are adding more tests to our test suite to catch these kinds of problems before we cut a release. We are adding more tests to our test suite to catch these kinds of problems before we cut a release.