[issue19674] Add introspection information for builtins

[Nick Coghlan]

Nick Coghlan added the comment:

+1 from me (I see this as the key benefit of argument clinic).

For 3.5, we can look at ducktyping on the attribute, but for now I think
it's worth keeping that text format internal to CPython.

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<http://bugs.python.org/issue19674>
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