From d2ed77fafe9c3762d19dfd9ae43938d2aebc7bbf Mon Sep 17 00:00:00 2001
From: Jim Fulton <jim@zope.com>
Date: Tue, 31 Aug 2004 22:16:42 +0000
Subject: Fixed collector issue 266

http://collector.zope.org/Zope3-dev/266
---
 taldefs.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/taldefs.py b/taldefs.py
index c3fbcfb..54bca67 100644
--- a/taldefs.py
+++ b/taldefs.py
@@ -149,9 +149,17 @@ def isCurrentVersion(program):
     version = getProgramVersion(program)
     return version == TAL_VERSION
 
+def isinstance_(ob, type):
+    # Proxy-friendly and faster isinstance_ check for new-style objects
+    try:
+        return type in ob.__class__.__mro__
+    except AttributeError:
+        return False
+            
+
 def getProgramMode(program):
     version = getProgramVersion(program)
-    if (version == TAL_VERSION and isinstance(program[1], tuple) and
+    if (version == TAL_VERSION and isinstance_(program[1], tuple) and
         len(program[1]) == 2):
         opcode, mode = program[1]
         if opcode == "mode":
@@ -160,7 +168,7 @@ def getProgramMode(program):
 
 def getProgramVersion(program):
     if (len(program) >= 2 and
-        isinstance(program[0], tuple) and len(program[0]) == 2):
+        isinstance_(program[0], tuple) and len(program[0]) == 2):
         opcode, version = program[0]
         if opcode == "version":
             return version
-- 
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