I asked a few people privately but I thought it would be good to get
more opinions...
If I do
asadmin set a=b c=d e=f
and "c" is an invalid name, what do you expect to happen?
1. fail after setting "a"?
2. fail after setting "a" and "e"?
3. fail before setting anything?
4. succeed with a warning that "c" wasn't set?
Right now (with my pending changes) it does #1 because that's what
was easy to implement.