Issue #13645: pyc files now contain the size of the corresponding source
code, to avoid timestamp collisions (especially on filesystems with a low
timestamp resolution) when checking for freshness of the bytecode.
diff --git a/Lib/pkgutil.py b/Lib/pkgutil.py
index bdea23e..ef027be 100644
--- a/Lib/pkgutil.py
+++ b/Lib/pkgutil.py
@@ -21,7 +21,7 @@
     if magic != imp.get_magic():
         return None
 
-    stream.read(4) # Skip timestamp
+    stream.read(8) # Skip timestamp and size
     return marshal.load(stream)