Yield's a SearchResult for each feature within the bounds of rect.
Every node in the FGB index tree has a bounding rect, all of the nodes children are contained within that bounding rect. The leaf nodes of the tree represent the features of the collection.
As we traverse the tree, starting from the root, we'll need to read more data from the index. When we don't already have this range data buffered locally, an HTTP fetch is triggered. For performance, we merge adjacent and nearby request ranges into a single request, reasoning that fetching a few extra bytes is a good tradeoff if it means we can reduce the number of requests.
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A feature found to be within the bounding box
rect(offset, index)
offset: Byte offset in feature data sectionindex: feature number