For any form or workflow logic around user filtering and person or group value matching you will eventually run into working with the SharePoint claim. The actual value of the user within SharePoint. So as I respond to those posts I came across two blogs that explain what the formatting actually means for the claims and why i:0#.w|domain\user is used. I hadn't seen these before and I thought it to be helpful to post the explanation here to help others.
SharePoint 2013 and SharePoint 2010 display identity claims with the following encoding format:
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.