Type Alias EpochStart

EpochStart: StorageDescriptor<[], FixedSizeArray<2, number>, false>

The block numbers when the last and current epoch have started, respectively N-1 and N. NOTE: We track this is in order to annotate the block number when a given pool of entropy was fixed (i.e. it was known to chain observers). Since epochs are defined in slots, which may be skipped, the block numbers may not line up with the slot numbers.