[ZCM] [ZC] 1332/ 1 Request "Catalog needs to wean itself off of BTrees Length as __len__ for HEAD"

[Collector: Zope Bugs, Features, and Patches ...]

Issue #1332 Update (Request) "Catalog needs to wean itself off of BTrees Length as __len__ for HEAD"
 Status Pending, Zope/bug critical
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  http://zope.org/Collectors/Zope/1332

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= Request - Entry #1 by mcdonc on May 15, 2004 5:46 pm

The Catalog uses a BTrees Length object as it's instance's __len__, but this no longer works as expected on the HEAD when the Catalog is a new-style class (as per BTrees Length module docs):

    It is tempting to to assign length objects to __len__ attributes
    to provide instance-specific __len__ methods. However, this no
    longer works as expected, because new-style classes cache
    class-defined slot methods (like __len__) in C type slots.  Thus,
    instance-define slot fillers are ignores.

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