[wxlua-users] Multibyte characters not working with Unicode build

[strawman <str...@la...>]

With a Unicode build of wxMSW and wxLua, trying to access any string 
containing multibyte characters (e.g. with wxTextCtrl::GetValue) returns 
nil.  The same issue is present in the wxLua editor; if any multibyte 
characters are in the buffer when a script is saved, the saved file is 0 
bytes in length, and running the script silently fails.

Is this a bug (or an issue with my build), or is there some specific way 
to correctly handle multibyte characters?