Function is_cursive_script 

fn is_cursive_script(script: Script) -> bool

From https://www.w3.org/TR/css-text-3/#cursive-script: Cursive scripts do not admit gaps between their letters for either justification or letter-spacing. The following Unicode scripts are included: Arabic, Hanifi Rohingya, Mandaic, Mongolian, N’Ko, Phags Pa, Syriac