safeDecodeUInt64
Reads a ULong/UInt64 from the array's current position, and then increments the position. If there are not enough bytes in the array, it assumes that the remaining length is padded with zeroes.
Reads a ULong/UInt64 from the array's current position, and then increments the position. If there are not enough bytes in the array, it assumes that the remaining length is padded with zeroes.