title: Angular Material Mat-Select ngModel boolean Value Not working
body: <p>I use mat-select  To select a user's gender in angular 7 project and angular material</p>
  
  <pre><code> &lt;mat-form-field&gt;
            &lt;mat-select placeholder="Gender" required 
              formControlName="isMale" 
              [(ngModel)]="userProfile.isMale"&gt;
              &lt;mat-option value="false"&gt;Women&lt;/mat-option&gt;
              &lt;mat-option value="true"&gt;Men&lt;/mat-option&gt;
            &lt;/mat-select&gt;
            &lt;mat-hint align="end"&gt;Please Select...&lt;/mat-hint&gt;
            &lt;mat-error *ngIf="isControlHasError('isMale','required')"&gt;&lt;strong&gt;Please Select Gender&lt;/strong&gt;
            &lt;/mat-error&gt;
          &lt;/mat-form-field&gt;
  </code></pre>
  
  <p>userProfile get from server and isMale property is boolean type but after get data do not show selected value on mat-select
  I Also use this way but not work </p>
  
  <pre><code>        &lt;mat-option [value]="'false'"&gt;Women&lt;/mat-option&gt;
          &lt;mat-option [value]="'true'"&gt;Men&lt;/mat-option&gt;
  </code></pre>
  
  <p>but it doesn't work</p>