.id is not decimal for /ppp/active/print

The .id field returned from calling /ppp/active/print looks like a memory location to me, this is what I get back:

<<< /ppp/active/print
<<< =.proplist=.id
<<<
>>> !re
>>> =.id=*80000010

Whereas when I call other commands (/interface/print, /radius/print, etc…), .id seems to be consistently decimal.

<<< /interface/print
<<< =.proplist=.id
<<<
>>> !re
>>> =.id=*1

Am I missing something? This is on 6.27. Thanks.