Emitted number from Angular Element turns into string when reaching javascript event listener

I have created a web component in Angular Elements which defines and emits events like this:

@Input() groupId: number = -1;

@Output('group_change') groupChange!: EventEmitter<number>;
...
this.groupChange.emit(groupId);

I have added the web component to a JavaScript application with an event listener:

this.myAngularElement.addEventListener('group_change', evt => {
    console.log(evt);
});

What is unexpected is that the number has been converted to a string in the event listener. Is there an explanation for why this happens, and maybe even a way to prevent it?

Via Active questions tagged javascript - Stack Overflow https://ift.tt/yAMKqGJ

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