BiDirectional text support
In the modern world the support for some languages that are right-to-left and mixing them with left-to-write words and numbers is crucial for a different software. At some point this should be supported everywhere, including the console.
I started to gather the information about BiDi support in various console terminals (and programs) in analogy with true color crusade at https://gist.github.com/XVilka/a0e49e1c65370ba11c17