@Jon: I could change the implementation to check `args.length` and
raise ArgumentError if the result is greater than 1. But wouldn't it
suffice to simply define the writer methods with only one argument?
@Xavier: I think users perceive `delegate` as a shorthand for:
def foo
@target.foo
end
and not
def foo
@target.__send__(:foo)
end
so I actually believe the proposed semantics more closely resembles
the perception. That's just my point of view, of course.
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