pyftsubset InterVariable.ttf --unicodes="U+0020-007F, U+00A0-00FF, U+2000-206F, U+2100-214F" --layout-features='*' --flavor="woff2" --output-file="regular.woff2"
https://clagnut.com/blog/2418 https://www.reddit.com/r/typography/comments/1gjeyuo/subsetting_google_variablework_sansttf_font_file/