pub type ErasStakers<T: Config> = StorageDoubleMap<_GeneratedPrefixForStorageErasStakers<T>, Twox64Concat, EraIndex, Twox64Concat, T::AccountId, Exposure<T::AccountId, BalanceOf<T>>, ValueQuery>;
Exposure of validator at era.
This is keyed first by the era index to allow bulk deletion and then the stash account.
Is it removed after
If stakers hasn’t been set or has been removed then empty exposure is returned.
Storage type is
StorageDoubleMap with key1 type EraIndex, key2 type T :: AccountId and value type Exposure < T :: AccountId, BalanceOf < T > >.