Merge heads

diff --cc Misc/NEWS
index 6fa7fd4fbdaaa9e4e64dd4191202e98de31dea81,8371fbb39dfe0d185a7094133c4c8f2cac7514fd..8816ea9ead9171aeeaa84cbbaa93a84b3605fe79
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,8 -10,8 +10,10 @@@ Release date: TB
  Core and Builtins
  -----------------
  
 +- Issue #28350: String constants with null character no longer interned.
 +
+ - Issue #26617: Fix crash when GC runs during weakref callbacks.
+ 
  - Issue #27942: String constants now interned recursively in tuples and frozensets.
  
  - Issue #21578: Fixed misleading error message when ImportError called with