setUint64 method Null safety
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.
Throws RangeError if
byteOffset is negative, or
byteOffset + 8 is greater than the length of this object.
void setUint64(int byteOffset, int value, [Endian endian = Endian.big]) => _unsupported();