Miller handles strings with any characters other than 0x00 or 0xff, using explicit UTF-8-friendly string-length computations. (I have no plans to support UTF-16 or ISO-8859-1.) Tabular output formats (pprint and xtab) are aligned correctly and the Miller `strlen` function correctly counts UTF-8 codepoints rather than bytes. Please file an issue at https://github.com/johnkerl/miller if you encounter bugs related to internationalization (or anything else for that matter).