diff -r 9cc55b743713 -r 57875cf423c9 mercurial/node.py
--- a/mercurial/node.py	Fri Oct 04 15:53:45 2019 -0400
+++ b/mercurial/node.py	Sat Oct 05 10:29:34 2019 -0400
@@ -20,6 +20,7 @@
     except binascii.Error as e:
         raise TypeError(e)
 
+
 nullrev = -1
 # In hex, this is '0000000000000000000000000000000000000000'
 nullid = b"\0" * 20
@@ -38,10 +39,11 @@
 
 # pseudo identifiers for working directory
 # (they are experimental, so don't add too many dependencies on them)
-wdirrev = 0x7fffffff
+wdirrev = 0x7FFFFFFF
 # In hex, this is 'ffffffffffffffffffffffffffffffffffffffff'
 wdirid = b"\xff" * 20
 wdirhex = hex(wdirid)
 
+
 def short(node):
     return hex(node[:6])