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GFCI detect electricity that may be going through your body.
GFCIs cut off electricity before you can be electrocuted. (arcing to ground )
GFCIs don't detect arcing that would create a fire. ( ??? arcing to ground ??
if not ground then what is it arcing to ????)
GFCIs are required in kitchen and bathroom outlets.
AGFI or arc fault breakers are required on bedroom circuits including (for some reason) overhead bedroom lights.

I guess I am cornfused ( misspelled on purpose ) .

An arc accoures becauch of a potential of voltage from hot to ground , in an electrical pannel nuteral and ground are the same thing ( tied to the SAME bus bar and then to a ground rod in residential circuts ) .
So is this AGFI like a circut breaker for the nuteral as well ????
I have seen a voltage potential from nuteral to ground befor ( micro processers HATE that !!!!!) but unless a building is JUST fixing to burn down the WORST voltage potential is along the lines of .25 Vac .
GFCIs open when they see a connection from hot to ground , SO since the nuteral and ground are the same ( give or take a little bit ) what is the benifits of a AGFI ???

I am NOT an electrical engineer , but I DO have to put up with some WAAAAAY messed up power in EXTREME situations WAAAAAY out in the boonies .