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`data.target.epoch` is used to count the active validator set. Because `get_committee_count_per_slot` is extremely inefficient the way the spec is written, clients cache it, or the underlying active validator set. Performing the checks in the given order leads to a (very unlikely) security issue where the a cold and above all, distant value may get used which may be costly - reordering the checks brings the value into a more reasonable range before using it.