Some kinds of characters (including ruled lines, ×, and •) have east asian (ambiguous width) characters, so they have single width in some environments, and double width in some environments.
In area where such characters have double width (mainly east asia), output layout of current hexyl (v0.3.1) is broken.

There are some way to fix this:

• Know line characters width (by wcwidth, CLI options, or something), and use appropriate number of line characters.
  • However this won't solve ×, and • issue.
• Or, use only ASCII characters when user wanted.
• Or, make symbols configurable (through config file or CLI options?)

If those characters are made configurable, #17 will be solved at the same time.