Do token filters support value 0?

Hello,

I am using Magic Login Pro and would like to create a specific user account whose magic links never expire and can be used multiple times.

According to the documentation, setting:

• Token TTL to 0
• Token Validity to 0

should make the token non-expiring and reusable.

I tried setting these values in the user profile settings, but after saving the user profile and reloading the page, both fields are empty again. So it seems that 0 is either not saved correctly or is treated as an empty value / no override.

As a workaround, I would like to use the following filters:

add_filter('magic_login_token_ttl_by_user', function ($ttl, $user_id) {
    if ((int) $user_id === XXX) {
        return 0;
    }

    return $ttl;
}, 10, 2);

add_filter('magic_login_token_validity_by_user', function ($validity, $user_id) {
    if ((int) $user_id === XXX) {
        return 0;
    }

    return $validity;
}, 10, 2);

Could you please confirm whether both filters are supposed to respect the value 0?

In particular:

1. Does magic_login_token_ttl_by_user support returning 0 to make the token never expire?
2. Does magic_login_token_validity_by_user support returning 0 to allow unlimited usage?
3. Is it expected that 0 cannot be saved in the per-user settings, or could this be a bug?

Thank you!