diff -r 968dd7e02ac5 -r 808b762679cd mercurial/changegroup.py
--- a/mercurial/changegroup.py	Wed Oct 10 00:21:02 2018 +0200
+++ b/mercurial/changegroup.py	Thu Oct 18 12:31:06 2018 +0200
@@ -698,7 +698,7 @@
                                         total=len(nodes))
 
     configtarget = repo.ui.config('devel', 'bundle.delta')
-    if configtarget not in ('', 'p1'):
+    if configtarget not in ('', 'p1', 'full'):
         msg = _("""config "devel.bundle.delta" as unknown value: %s""")
         repo.ui.warn(msg % configtarget)
 
@@ -707,6 +707,8 @@
         deltamode = repository.CG_DELTAMODE_PREV
     elif configtarget == 'p1':
         deltamode = repository.CG_DELTAMODE_P1
+    elif configtarget == 'full':
+        deltamode = repository.CG_DELTAMODE_FULL
 
     revisions = store.emitrevisions(
         nodes,