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Currently, the partition index page parser will create and store promoted index cursors for each entry. The assumption is that partition index pages are not shared by readers so each promoted index cursor will be used by a single index_reader (the top-level cursor). In order to be able to share partition index entries we must make the entries immutable and thus move the cursor outside. The promoted index cursor is now created and owned by each index_reader. There is at most one such active cursor per index_reader bound (lower/upper).