Merge #11131

diff --cc Misc/NEWS
index 45a724020b28f12655de7d8fbbe2bb643aea5548,8e953fefbfce2d1997ddc88136acceb4223cc750..3b426465f0378a3d35ee1e2745adcf11cab4c64c
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -62,8 -34,9 +62,11 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #11131: Fix sign of zero in decimal.Decimal plus and minus
+   operations when the rounding mode is ROUND_FLOOR.
+ 
 +- Issue #9935: Speed up pickling of instances of user-defined classes.
 +
  - Issue #5622: Fix curses.wrapper to raise correct exception if curses
    initialization fails.