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Added invariants to namedtuple (#172)

This patch introduces a special handling of `namedtuple` class. Namely,
`namedtuple` leverages `__new__` to create new tuples and merely calls
`object.__init__` as constructor. Therefore we can not simply wrap
`__init__` as it is a slot wrapper and will break the implementation of
`namedtuple`.

Fixes #171.

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