Real Login ID

Real Login ID

I am really scared that you expect the (real) userid by functions, but there's no option to read the real user id.
What do I mean:
Having the option within several functions to add "createdBy":"userid", there's no option read this.
https://www.zoho.com/deluge/help/system-variables.html
Zoho.Loginuser is the name (string).
Zoho.loginuserid is the mail (string)

Where is Zoho.loginuserrecordid (number / id)?
Which could be successfully used for "createdBy" functions.
Any other genius ideas here?
Thanks.