code: public Float64Array get(Float64Array buffer) {
            buffer.set(0,  m00);
            buffer.set(1,  m01);
            buffer.set(2,  m10);
            buffer.set(3,  m11);
            buffer.set(4,  m20);
            buffer.set(5,  m21);
            return buffer;
        }
docs: /* (non-Javadoc)
  @see org.joml.Matrix3x2dc#get(com.google.gwt.typedarrays.shared.Float64Array)