Ok, I understood your point.
 
But as per RFC 2865,
what is the meaning of then "UTF-8 encoded 10646 [7] characters", the [7]?
7 stands for what over here?

And one more thing as per RFC 2865,
1) As per this new RFC only only we need to support US-ASCII not any other character set, right?
2) Does free RADIUS only supporting US-ASCII or all universal character set?