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

nicky-eng · ethanfurman · hugovk · web-flow · commit 601f3a7b3391 · 2024-03-08T11:22:17.000-08:00
Co-authored-by: Ethan Furman &lt;ethan@stoneleaf.us&gt;
Co-authored-by: Hugo van Kemenade &lt;1324225+hugovk@users.noreply.github.com&gt;
diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
@@ -279,13 +279,20 @@ 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
          the exact value is unimportant you may use :class:`auto` instances and an
          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.
