Issue #2051 and patch from Alexander Belopolsky:
Permission for pyc and pyo files are inherited from the py file.
diff --git a/Misc/NEWS b/Misc/NEWS
index 7c81958..9e4a48b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and builtins
-----------------
+- Issue #2051: pyc and pyo files are not longer created with permission 644. The
+ mode is now inherited from the py file.
+
- Issue #2067: file.__exit__() now calls subclasses' close() method.
- Patch #1759: Backport of PEP 3129 class decorators.