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Working towards history results which contain mixed asset types, add a reader which makes `load_raw_arrays` return results indexed on the session/minute ranges specified by the specified `trading_calendar` instead of the calendar of the backing reader. This reader will be used to make Equity readers align with Future readers. It is intended for use as part of another reader (which will dispatch queries based on asset type and then recombined results) which will be passed to the `[Minute|Session]HistoryLoaders in the data portal.