clarify assignments in val reg not change
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@ -1768,7 +1768,10 @@ and perform the following updates:
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If a validator registry update does _not_ happen do the following:
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* Let `epochs_since_last_registry_change = (state.slot - state.validator_registry_update_slot) // EPOCH_LENGTH`.
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* If `epochs_since_last_registry_change` is an exact power of 2, set `state.current_epoch_calculation_slot = state.slot` and `state.current_epoch_seed = hash(get_randao_mix(state, state.current_epoch_calculation_slot - SEED_LOOKAHEAD) + get_active_index_root(state, state.current_epoch_calculation_slot))`. Note that `state.current_epoch_start_shard` is left unchanged.
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* If `epochs_since_last_registry_change` is an exact power of 2:
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* Set `state.current_epoch_calculation_slot = state.slot`
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* Set `state.current_epoch_seed = hash(get_randao_mix(state, state.current_epoch_calculation_slot - SEED_LOOKAHEAD) + get_active_index_root(state, state.current_epoch_calculation_slot))`.
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* _Note_ that `state.current_epoch_start_shard` is left unchanged.
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**Invariant**: the active index root that is hashed into the shuffling seed actually is the `hash_tree_root` of the validator set that is used for that epoch.
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