gh-105535 Document potential performance trap during enum creation (GH-107119)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
index 49bf40aa5a2869473b155811a7f8617c5b2ae6e3..d84d9d9b4161b1e38de0775374f61f701993bf32 100644 (file)
--- a/Doc/library/enum.rst
+++ b/Doc/library/enum.rst
@@ -279,6 +279,8 @@ Data Types
          >>> Color.RED.value
          1
 
+      Value of the member, can be set in :meth:`~object.__new__`.
+
       .. note:: Enum member values
 
          Member values can be anything: :class:`int`, :class:`str`, etc.  If
@@ -286,6 +288,11 @@ Data Types
          appropriate value will be chosen for you.  See :class:`auto` for the
          details.
 
+         While mutable/unhashable values, such as :class:`dict`, :class:`list` or
+         a mutable :class:`~dataclasses.dataclass`, can be used, they will have a
+         quadratic performance impact during creation relative to the
+         total number of mutable/unhashable values in the enum.
+
    .. attribute:: Enum._name_
 
       Name of the member.