Nothing to do with Unicode (Score 0)

"Full-width and half-width encoding is a technique for encoding Unicode characters" No, these are not Unicode encoding techniques, whoever wrote that description has no clue. They are forms of Latin characters used in Japanese, with clear usage, and long history. You can find them in the JIS standards (Japanese Standards Association), and where used by UNIX, MS-DOS, Windows 3.x, Mac OS, long-long before Unicode was even created. The problems is not Unicode, is not even JIS, is the vendors that have no clue about international issues that exist for more than 20 years now.