[ZODB-Dev] BTrees package problems

[Christian Tismer]

The BTrees package is an attempt to isolate certain things from ZODB.

While I appreciate the general intent, I cannot see the advantage at
this point:

- BTrees can be imported alone, yes. But it has the extensions prepared
    with special ZODB slots, which makes this very questionable.

- BTrees furthermore claims the BTrees global bame for it, all though it
    is not a general BTree package, but for ZODB BTrees, only.

- BTrees has a serious bug, see the following example:

> >>> from BTrees import OOBTree as BT
> >>> t = BT.BTree()
> >>> for num in range(100):
> ...   k = str(num)
> ...   t[k] = k
> ...
> >>> t._firstbucket._next = None
> >>> len(t)
> Bus error: 10
> (tmp)minimax:doc tismer$

So there is either an omission to make t._next() read-only, or a check
of its validity is missing.

Actually, I would like to add a callable-check instead, to allow for more
flexible derivatives.

* this was my second little rant about ZODB. Not finished as it seems.

please, see this again as my kraut way of showing interest in improving
very good things.

cheers -- chris

-- 
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