Merge 3.3.

diff --cc Misc/NEWS
index 43e31d3a9257c16fa9149fae02f3bea2fe02a392,e09e67d8ae4cccd7ae7bdfd346bb77598b132672..a4379fca6008f82153c59a5aee901c5ed9a4d754
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -110,9 -80,9 +110,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #16431: Use the type information when constructing a Decimal subtype
+   from a Decimal argument.
+ 
 +- Issue #15641: Clean up deprecated classes from importlib
 +  Patch by Taras Lyapun.
 +
  - Issue #16350: zlib.Decompress.decompress() now accumulates data from
    successive calls after EOF in unused_data, instead of only saving the argument
    to the last call. Patch by Serhiy Storchaka.