Unicode 、実のところ U+10FFFF までしか使われないのでコードポイントとしては 21 bit で済むし、 UTF-32 は無駄すぎる
unicode - Why is there no UTF-24? - Stack Overflow
https://stackoverflow.com/a/10143909
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stackoverflow.comWhy is there no UTF-24?Possible Duplicate:
Why UTF-32 exists whereas only 21 bits are necessary to encode every character?
The maximum Unicode code point is 0x10FFFF in UTF-32. UTF-32 has 21 information bits and 11