as.name is not idempotent

[Douglas Bates]

At least I think the word I want "idempotent" - it has been a long
debugging session and my brain is fried so I am not sure.

What I mean is that as.name applied to a name gives an error.
 > as.name("foo")
 foo
 > as.name(as.name("foo"))
 Error in as.name(x) : character argument required

It might help if it were a bit more flexible about the arguments it
accepts.
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