It occurred to me that it would be nice if `--data-dir` as only option and without any argument would print the default data dir path so that one could use `$(pandoc --data-dir)` to get there. I just wanted to probe the waters whether others think this is utterly silly or not before opening an issue. (I'm aware that you could define a variable in your shell rc file, but doing so on every machine/device[^1] is a hassle.)