writeInt64 method
Writes a int64 i into the buffer
i: The value to writeendian: The endianess, Endian.big by default
Implementation
void writeInt64(int i, [Endian endian = Endian.big]) {
_ensureSize(int64_size);
_scratchData!.setInt64(_scratchOffset, i, endian);
_scratchOffset += int64_size;
}