DuplicateAt
*value = node->DuplicateAt(fDuplicateNode, fIsFragment,
offset = node->DuplicateAt(offset, fIsFragment, 0);
off_t DuplicateAt(off_t offset, bool isFragment,
*value = node->DuplicateAt(fDuplicateNode,fIsFragment,fDuplicate++);
offset = node->DuplicateAt(offset,fIsFragment,0);
off_t DuplicateAt(off_t offset, bool isFragment, int8 index) const;