writeFloat64 method
Writes a float64 d into the buffer
d: The value to writeendian: The endianess, Endian.big by default
Implementation
void writeFloat64(double d, [Endian endian = Endian.big]) {
_ensureSize(float64_size);
_scratchData!.setFloat64(_scratchOffset, d, endian);
_scratchOffset += float64_size;
}