static fun encodeULong(value: Long, bitLength: Int): Bytes (source)
Encode an unsigned long integer to a Bytes value. Note that value is a native signed long, but will be interpreted as an unsigned value.
bitLength - the bit length of the integer value (must be a multiple of 8)
IllegalArgumentException - if the value is too large for the specified bitLength
Return
the SSZ encoding in a Bytes value