[Zope] Why is the context different for these two methods?

[Gary Duke Speer]

A DTML Method with <dtml-in "objectValues('Folder')">
returns the sub-folders of it's container folder.

in the same context,
A DTML Method with <dtml-in "objectIds('Folder')">
returns the sub-folders of it's container folder's parent folder.
why should objectIds look to the grandparent folder?

Because these are in a DTML Method, I would expect both to exaluate in the
context of the containing folder.  Is objectIds somehow calling it's
container folders' aq_parent namespace?
This would seem to violate the "containment before context" paradigm.

Thanks for any enlightenment,
Duke

(Zope 2.6.1)