angular: Incorrect template errors with union types

I’m submitting a…

[x] Bug report  

Current behavior

Imported from https://github.com/angular/vscode-ng-language-service/issues/231

With the following component

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello {{name}}</h2>
      <p *ngIf="name == 'steve'">hi steve</p>
    </div>
  `,
})
export class App {
  name: string | number;
  constructor() {
    this.name = `Angular!`
  }
}

An error is given for the *ngIf value: [Angular] Expected the operants to be of similar type or any.

Expected behavior

No template error appears similar to https://github.com/angular/vscode-ng-language-service/issues/16