Be aware that svgo is a lossy operation. One thing it does is round the digits in numbers to a certain precision. When I last worked with it, it also did some things I did not like such as mess with viewboxes. I found that it messed up the sizing of SVGs embedded with <img> tags in certain browsers. It has been a while since I used it though.
I was curious about this. It looks like it has numerous individual plugins that provide the actual functionality. Do you know if some of the plugins are lossless, while others lossy? It may be possible to pick and choose the lossless ones.
It has a boat load of plugins. I looked at a few and after puzzling over which were default enabled and default disabled I decided I didn't want to use a program with unsafe defaults.
