diff -r 4a9570e389b2 -r 7ee07e1a25c0 mercurial/configitems.py
--- a/mercurial/configitems.py	Tue Jan 11 09:56:03 2022 +0100
+++ b/mercurial/configitems.py	Tue Jan 11 21:40:08 2022 +0100
@@ -1375,7 +1375,7 @@
 coreconfigitem(
     b'format',
     b'use-share-safe',
-    default=False,
+    default=True,
 )
 coreconfigitem(
     b'format',