--- a/mercurial/configitems.toml	Fri Feb 02 04:46:54 2024 +0100
+++ b/mercurial/configitems.toml	Wed Jan 10 18:58:42 2024 +0000
@@ -2913,3 +2913,8 @@
 name = "date-format"
 default = ""
 in_core_extension = "blackbox"
+
+[[items]]
+section = "format"
+name = "mmap-revbranchcache"
+default = false