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Very nice .. yes using a bare exception causes the expected 
TypeError exception. I tried this in Python 2.4 and without 
any changes it correctly raises TypeError. 

I checked the differences between the 2.3 dbtables and 2.4 
and there are no significant changes (i.e. the Modify 
catches the same exceptions) so it's got to be somewhere 
else.

I've uploaded a simple test case that creates a database, 
does an Insert and then attempts the Modify with a string 
which corrupts the DB in Python 2.3.