acquisition wrappers, but this time the bugfix is clearer.  The second
argument to an index constructor is usually not "caller"; it's usually
"ignore_ex", which gets stored as a meaningless attribute and ignored.

The bugfix builds upon the ugly code that's already there.  Ugly code
begets ugly code, unfortunately.

        results of a callable.  Do not attempt to index None.

encapsulation the storage lock file.

cleanly.  Backported from ZODB4.

used with Python 2.3.

Python 2.3.

will generate a PendingDeprecationWarning in Python 2.3.

en traversing from a non-mapping object, rather than an obscure AttributeError o
n __getitem__

evaluates to "True". Correct usage is "if find(...) >= 0".

       calling object. This caused caller.getPhysicalPath() to fail for
       indexes depending on this information.

information don't get out of sync.

a bit more readable

        Zope logfiles)

empty lead to an empty index.

     - Collector #816: dtml-sendmail corrupted header if message was
       left blank.

       IISet. This should result in less memory usage.

Turn off HTTP Request's URL cache until traversal is done.  Incorrect values were being cached in the presence of a DTML
Method Access Rule.

new-install-branch, which this file is not part of.  Sorry.

obsolescence.

- move some things out of the try/except block that aren't getting
  protected by the try
- reduce the amount of code in some helper functions