Fix lookup signature in Message Lookup Semantics
#164
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I think the signature as given involves the subject of the lookup twice, in both the `rec` and `obj` formal arguments. Because `lookup` is not applied to the original receiver only, I have chosen to keep `obj`. This is coherent with subsequent mentions of `lookup`
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I think the signature as given involves the subject of the lookup twice, in both the
recandobjformal arguments.Because
lookupis not applied to the original receiver only, I have chosen to keepobj. This is coherent with subsequent mentions oflookup