Angular rc9, stops escape unicode

[glebmachine]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

Yes, angular/cli 8.x.x work properly

Yes, the previous version in which this bug was not present was: ....

Description

Angular cli with rc9 stops escape cyrillic to unicode characters.
Previously all characters like Э becomes \u042d

As i understand it's about TerserPLugin ascii_only flag

A clear and concise description of the problem...

🔬 Minimal Reproduction

1. create repo
2. add alert('Э'); anywhere
3. buld
4. check for compile output, it should convert to alert('\u042d');

🔥 Exception or Error

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 9.0.0-rc.8
Node: 12.1.0
OS: darwin x64

Angular: 9.0.0-rc.9
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.900.0-rc.5
@angular-devkit/build-angular      0.900.0-rc.9
@angular-devkit/build-ng-packagr   0.900.0-rc.9
@angular-devkit/build-optimizer    0.900.0-rc.9
@angular-devkit/build-webpack      0.900.0-rc.9
@angular-devkit/core               9.0.0-rc.5
@angular-devkit/schematics         8.3.14
@angular/cdk                       9.0.0-rc.7
@angular/cli                       9.0.0-rc.8
@ngtools/webpack                   9.0.0-rc.9
@schematics/angular                8.0.0
@schematics/update                 0.900.0-rc.8
ng-packagr                         9.0.0-rc.3
rxjs                               6.5.4
typescript                         3.7.4
webpack                            4.41.2

Anything else relevant?