Playfair has two (or more?) rendering styles for numbers. Grapher currently uses the rendering in the screenshot on the left but the data viz task force has a slight preference for the rendering on the right.
Note: The way to enable this should be to add font-feature-settings: lnum - or possibly adding that to $default-font-features (which should be fine, because Lato uses lnum by default.
Playfair has two (or more?) rendering styles for numbers. Grapher currently uses the rendering in the screenshot on the left but the data viz task force has a slight preference for the rendering on the right.