Users field store data key

The CMS Questions
1

Hi all,

I have a question I can’t find the answer to.

Why users field store the email field instead of id?
You know that email may change but id won’t change.

Also id key works on panel but updating with email when page saved:

----

Customerid:

- feYobpjD

----

In same way, updating with email instead of id even send ID data like that:

page('mypage')->update([
    'customerId' => kirby()->user()->id(),
]);

Thanks in advance.

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