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I was mainly considering the decorator use case when I wrote
the function, so the idea of a wrapped function without a
dict attribute didn't occur to me (obviously!).

So definitely fix it on the trunk, and I'd say backport it
to 2.5 as well. My reasoning regarding the latter is that
the example code in the documentation for functools.wraps is
actually buggy with the current behaviour. With this bug
fixed, the documentation example will work as intended.