Converting Angular 5 select option values to strings is a must

I have set up a basic select connected to a variable like this:

<select id="client" name="client" [(ngModel)]="order.clientId">
    <option *ngFor="let client of clients" [value]="client.id">
        {{ client.name }}
    </option>
</select>

The clients class has a numeric id value:

export class NameAndId {
    id: number;
    name: string;

    constructor(id: number, name: string) {
        this.id = id;
        this.name = name;
    }
}

I would expect the value to be numeric since both the value in the clients class and order.clientId are defined as numbers. However, when passing the order object through an HttpClient post call like this, it is being encoded as a string:

return this.http.post<HttpResponse<any>>(this.baseUrl, order, {observe: 'response'});

Why is it not showing as a numeric value?

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