GbxDelegate>> fetch* will error if traversal size exceeded
The behavior for GbxDelegate >> fetch* (such as GbxDelegate >> fetch:varyingOOPsAt:) was rearchitected in release 7.0 to use the
traversal buffer mechanism. However, when the object size exceeds
the traversal buffer size, the fetching mechanism does not work and
will result in a walkback, Message not understood: #fetchMoreTraversal.
Ensure that the traversal buffer size is large.