bundle budgets fail with decimal values

[StephenFluin]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting

Command (mark with an x)

- [x] build

Versions

Angular CLI: 6.2.0-rc.0
Node: 9.2.0
OS: linux x64
Angular: 6.1.4
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.8.0-rc.0
@angular-devkit/build-angular 0.8.0-rc.0
@angular-devkit/build-optimizer 0.8.0-rc.0
@angular-devkit/build-webpack 0.8.0-rc.0
@angular-devkit/core 0.8.0-rc.0
@angular-devkit/schematics 0.8.0-rc.0
@angular/cli 6.2.0-rc.0
@ngtools/webpack 6.2.0-rc.0
@schematics/angular 0.8.0-rc.0
@schematics/update 0.8.0-rc.0
rxjs 6.2.2
typescript 2.7.2
webpack 4.17.1

Repro steps

ng new my-app

// add budget:

budgets": [{
                "type":"initial",
                "maximumError": "0.5mb",
                "maximumWarning": "0.2mb"
              }]

ng bulid --prod

The log given by the failure

$ ng build --prod
                                                                                       
Date: 2018-08-27T15:46:13.628Z
Hash: 9ec635e1a8fc425b26c3
Time: 9406ms
chunk {0} runtime.06daa30a2963fa413676.js (runtime) 1.44 kB [entry] [rendered]
chunk {1} main.04899fccb3a420777fc6.js (main) 169 kB [initial] [rendered]
chunk {2} polyfills.f6ae3e8b63939c618130.js (polyfills) 59.6 kB [initial] [rendered]
chunk {3} styles.3bb2a9d4949b7dc120a9.css (styles) 0 bytes [initial] [rendered]

WARNING in budgets, maximum exceeded for initial. Budget 200 undefined was exceeded by 230 kB.

ERROR in budgets, maximum exceeded for initial. Budget 500 undefined was exceeded by 230 kB.

Desired functionality

Budgets should apply successfully and not be of undefined size.

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