@elextr It seems that we actually use [Exuberant Ctags](https://sourceforge.net/projects/ctags/), which is no longer maintained. [Universal Ctags](https://github.com/universal-ctags/ctags) supports UTF-8, [although not multi-byte characters such as Emoji](https://github.com/universal-ctags/ctags/issues/1275).
P.S. Issue #1337!!