API and how "unbegrenzt" is handled

I please need an explanation of what "unbegrenzt" means in the context of the parameters mailquota and webspace of the command HostingSubscriptionAdd. I know what the German word means, but I don't know how LiveConfig handle this non-value. For instance, when I create an account with both unlimited webspace, how is that handled? What if both mailquota AND webspace are unlimited? What happens when there are more then one account that have unlimited webspace and/or mailquota?

What happens when afterwards I put a value?

I pretend to use this to quickly migrate my accounts from the other server and then afterwards account after account adjust the quotas manually. I try to avoid complicated algorithms in my script to work around quota overselling in the previous control panel.