diff -r a6543983b8f4 -r 58adcabc295f mercurial/configitems.py
--- a/mercurial/configitems.py	Sat May 20 01:39:13 2023 +0200
+++ b/mercurial/configitems.py	Fri May 19 14:49:50 2023 +0200
@@ -1298,6 +1298,11 @@
 )
 coreconfigitem(
     b'experimental',
+    b'stream-v3',
+    default=False,
+)
+coreconfigitem(
+    b'experimental',
     b'treemanifest',
     default=False,
 )