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| -rw-r--r-- | Doc/whatsnew/3.10.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst index 249eb733a88..9b9dd31a3be 100644 --- a/Doc/whatsnew/3.10.rst +++ b/Doc/whatsnew/3.10.rst @@ -836,6 +836,13 @@ Other Language Changes effectless under ``from __future__ import annotations``. (Contributed by Batuhan Taskaya in :issue:`42725`.) +* Hashes of NaN values of both :class:`float` type and + :class:`decimal.Decimal` type now depend on object identity. Formerly, they + always hashed to ``0`` even though NaN values are not equal to one another. + This caused potentially quadratic runtime behavior due to excessive hash + collisions when creating dictionaries and sets containing multiple NaNs. + (Contributed by Raymond Hettinger in :issue:`43475`.) + New Modules =========== |