[Python-ideas] Add PassedArgSpec class to types and expose mapping given an ArgSpec.

[Neil Girdhar]

As far as I know, the way that arguments are mapped to a parameter 
specification is not exposed to the programmer.  I suggest adding a 
PassedArgSpec class having two members: args and kwargs.  Then, 
inspect.ArgSpec can take an argument specification and decode the 
PassedArgSpect (putting the right things in the right places) and return a 
dictionary with everything in its right place.

I can only think of one use for now, which is replacing "arguments" in the 
returned tuple of __reduce__ and maybe allowing it to be returned by 
"__getnewargs__".  It might also be nice to store such argument 
specifications instead of the pair args, kwargs when storing them in lists.

Best,

Neil
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