IDN's with any ASCII character

"Jarrod Hollingworth" <[email protected]>
Newsgroups gmane.ietf.idn
Message-ID <[email protected]> 
Will IDN's allow encoding of domain names with *any* ASCII character?

For example, let's say that I want to register the domain name
"this&that.com" or "100^10.com".

Will IDN allow this or does it only facilitate international languages?

Regards,
Jarrod Hollingworth
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