- Fixed issue where inadvertent use of the Python ``__contains__``

- Fixed issue where inadvertent use of the Python ``__contains__``
override with a column expression (e.g. by using ``'x' in col``)
would cause an endless loop in the case of an ARRAY type, as Python
defers this to ``__getitem__`` access which never raises for this
type.  Overall, all use of ``__contains__`` now raises
NotImplementedError.
fixes #3642