From 37faed2532b3baf3b24cd4839aa5f5242b0c807d Mon Sep 17 00:00:00 2001
From: Tim Peters <tim.peters@gmail.com>
Date: Sun, 25 Aug 2002 19:21:27 +0000
Subject: Sped union by a factor of 3-4.

---
 Lib/sets.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/sets.py b/Lib/sets.py
index e88e845..10138fc 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -154,7 +154,8 @@ class BaseSet(object):
         """
         if not isinstance(other, BaseSet):
             return NotImplemented
-        result = self.__class__(self._data)
+        result = self.__class__()
+        result._data = self._data.copy()
         result._data.update(other._data)
         return result
 
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