Full Unicode would be nice. e.g. ↓,↑,☑,☒,☹

The switch to a utf8 representation for strings would break too many existing programs which assume 1 byte==1 character, including a lot of CraftOS, and Lua 5.1 doesn't even have the utf8 API. The current iso-8859-1 string representation was chosen as the best compromise for this.

(As an aside, this is fixed in CraftOS 2.0)