setUint64 abstract method
Sets the eight bytes starting at the specified
byteOffset in this object
to the unsigned binary representation of the specified
which must fit in eight bytes.
In other words,
value must be between
0 and 264 - 1, inclusive.
byteOffset must be non-negative, and
byteOffset + 8 must be less than or equal to the length of this object.
void setUint64(int byteOffset, int value, [Endian endian = Endian.big]);