I'd find it very useful to be able to query a terminal to see if it has font support for a given list of characters.
This would allow TUIs to use recent unicode characters which may not be supported (e.g. Symbols for Legacy Computing), or private use characters (e.g. powerline symbols & font-awesome icons), while falling back to a more universally supported character in terminals that do not support them.
This would allow TUIs to use recent unicode characters which may not be supported (e.g. Symbols for Legacy Computing), or private use characters (e.g. powerline symbols & font-awesome icons), while falling back to a more universally supported character in terminals that do not support them.