title: How to display different value of input than ngModel
body: <p>I have an input field like this: 
  <code>&lt;input myCurrencyFormatter type="text" [(ngModel)]="value" name="value"&gt;</code></p>
  
  <p>The input value should be formatted to number such as: 1 024,50(this value should be only visible for input), but value in the ngModel should be stay not formated: 1024.05(dot instead a comma). How I can do it? This is my directive and pipe: <a href="https://stackblitz.com/edit/angular-6smqvf?file=src%2Fapp%2Fapp.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-6smqvf?file=src%2Fapp%2Fapp.component.html</a>
  I don't know how I can input comma and save to model dot.</p>