Angular ngModel doesn't update when `ngModelChange` keeps value

I think the cause is that modifying the value on ngModelChange breaks change detection, for example if you change the value back to the previous value, because an invalid character was added.

A workaround:

constructor(private cdRef:ChangeDetectorRef) {}

fieldChanged(field) {
    console.log(field.text);
    field.text = Array.from(field.text).filter((char:string) => "0123456789".indexOf(char) != -1).join("");
    console.log(field.text);
    var tmp = field.text;
    field.text = null; // or some other value that normally won't ever be in `field.text`
    this.cdRef.detectChanges();
    field.text = tmp;
    this.cdRef.detectChanges(); // I guess this 2nd call won't be necessary
}