PEP 554: Defer adding support for "inheriting" settings. (gh-1016)

pep-0554.rst

@@ -1263,6 +1263,21 @@ Support prioritization in channels
 
 A simple example is ``queue.PriorityQueue`` in the stdlib.
 
+Support inheriting settings (and more?)
+---------------------------------------
+
+Folks might find it useful, when creating a new subinterpreter, to be
+able to indicate that they would like some things "inherited" by the
+new interpreter.  The mechanism could be a strict copy or it could be
+copy-on-write.  The motivating example is with the warnings module
+(e.g. copy the filters).
+
+The feature isn't critical, nor would it be widely useful, so it
+can wait until there's interest.  Notably, both suggested solutions
+will require significant work, especially when it comes to complex
+objects and most especially for mutable containers of mutable
+complex objects.
+
 
 Rejected Ideas
 ==============