merge

diff --cc Include/object.h
Simple merge

diff --cc Misc/NEWS
index fa5d85a408e40f63bcc43217fa6b9c48b7df06e8,7898b9b592c59be6c8eb3bb1b8123438e7c6e050..91d402981f35398a5d5a2f2411bf3b3733f6db65
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -58,6 -89,6 +58,9 @@@ Librar
    integer (as in Python 2).  Au_read and Au_write now correctly works with file
    object if start file position is not a zero.
  
++- Issue #18594: The fast path for collections.Counter() was never taken
++  due to an over-restrictive type check.
++
  - Issue #19053: ZipExtFile.read1() with non-zero argument no more returns empty
    bytes until end of data.
  

diff --cc Modules/_collectionsmodule.c
Simple merge

diff --cc Objects/typeobject.c
Simple merge