ng-zorro select框ngModel默认值为对象时，select内容无法显示

框架：angular8
UI： NG-ZORRO 7.5
问题： 当nz-select框为多选nzMode="multiple"，nz-select所传[nzValue] 值为对象时，此时默认值ngModel不显示，选中一个选项后页面可显示。
代码：

<nz-select name="program" nzMode="multiple"
            [nzMaxMultipleCount]="3"
            [nzMaxTagPlaceholder]="programPlaceHolder"
            [(ngModel)]="policy['program']['data']"
            nzPlaceHolder="请选择应用程序策略">
     <nz-option *ngFor="let option of policy['program']['list']" [nzLabel]="option.name [nzValue]="option">
     </nz-option>
     <ng-template #programPlaceHolder let-selectedList>已选中 {{ policy['program'['data'].length}}项
     </ng-template>
</nz-select>
                            

注：若policy['program']['data']值为{name:"111", id:1}，页面无法select选中内容无法回显

解决: ngModel 取到的值为选中 nz-option 的 nzValue 值，当 nzValue 传入为一个对象时，ngModel 获取的值也是一个对象，此时[compareWith]="compareFn"，comparwith用法见这里

代码改进：
html:

<nz-select name="program" nzMode="multiple"
            [compareWith]="compareFn"
            [nzMaxMultipleCount]="3"
            [nzMaxTagPlaceholder]="programPlaceHolder"
            [(ngModel)]="policy['program']['data']"
            nzPlaceHolder="请选择应用程序策略">
     <nz-option *ngFor="let option of policy['program']['list']" [nzLabel]="option.name [nzValue]="option">
     </nz-option>
     <ng-template #programPlaceHolder let-selectedList>已选中 {{ policy['program'['data'].length}}项
     </ng-template>
</nz-select>

ts:

// 解决select value值为对象，select默认值不展示问题
    compareFn = (o1: any, o2: any) => (o1 && o2 ? o1.name === o2.name : o1 === o2);