What is a valid key?

[Steven Grimm]

On Dec 20, 2007, at 10:22 AM, dormando wrote:
> So if you have a utf8 character that's a valid non-space high byte  
> for the first byte, but the second byte is a space, it'd break. I'm  
> not even sure if that happens though.

It can't. UTF-8 characters are *always* represented as either straight  
ASCII or a set of bytes with their high bits set.

http://en.wikipedia.org/wiki/UTF-8#Rationale_behind_UTF-8.27s_design

-Steve