bpo-33234: Add exact allocation optimization to lists in What's New (GH-10200)
In commit 372d705 a new optimization to the list() type was introduced but it was not added
to the optimization section in What's new for Python 3.8.
diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index 05b7d23..758d32e 100644
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -242,6 +242,11 @@
Note that this means that instances can no longer be weak-referenced and
that arbitrary attributes can no longer be added to them.
+* The :class:`list` constructor does not overallocate the internal item buffer
+ if the input iterable has a known length (the input implements ``__len__``).
+ This makes the created list 12% smaller on average. (Contributed by Pablo
+ Galindo in :issue:`33234`.)
+
Build and C API Changes
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