I don't understand the problem here.
d[p=q] --> d.__{get,set,del}item__((), ..., p=q)
d[1, p=q] --> d.__{get,set,del}item__((1), ..., p=q)
d[1, 2, p=q] --> d.__{get,set,del}item__((1, 2), ..., p=q)
d[1, 2, 3, p=q] --> d.__{get,set,del}item__((1, 2, 3), ..., p=q)
d[1, 2, ..., n, p=q] --> d.__{get,set,del}item__((1, 2, ..., n), ...,
p=q)
Now obviously the n=1 case is a wart. But the n=0 case isn't a wart. It's
just like n=2, n=3, etc.
You can't tell the difference between a single tuple argument and n
arguments for any n≠1. As far as I can tell the problem when n=0 is no more
or less serious than the problem when n≥2. I don't see the point of adding
another special case to the spec when it doesn't even solve the general
problem.
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