Terry J. Reedy added the comment:

This is much clearer.  What you got is a limitation of getfullargspec relative 
to signature (see the links).  In this case, you want follow_wrapped=True, to 
get the specific signature of the wrapped function instead of the generic 
signature of the wrapper*. With the patch, the tip in 3.6 and 3.7 is '(n, k)'.  
So yes, this is one of the changes consequent on the switch.  

>>> str(inspect.signature(f,follow_wrapped=False))
'(*args, **kw)'


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