The anti-aliasing on straight lines is done on the outside of the line, and this is very noticeable in some cases, e.g. in a serif font when curves often end with line segments

I think this means the strategy has to be revisited, and we need to do the antialiasing in the fill shader instead of adding triangles on the outside. This requires making sure there are no triangles with all three edges on the outline, but the article mentions an algorithm for this.