I have found, as an application evolves, some extra data is required which 
comes from elsewhere. 

For example, I have an application where data is read from a network 
socket, transformed and stored. For auditing, I later decided it was useful 
to capture the remote address from the socket right at the start, and 
finally to log it. With restrictive specs, I would have had to re-spec all 
the intermediate functions. As it was, they didn't know or need to know 
about the extra key/value in the map, just pass it along.

On puzzler's database example, I would have thought that restricting the 
keys that go into the DB should not be the job of spec (since functions may 
not be instrumented anyway), but the job of the 'core logic'. Maybe I am 
misunderstanding though.

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