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sqlpp11/tests
Roland Bock db0295a9d0 Remove tvin
This was a special feature for a project I was working on long ago.
It provided implicit behavior for trivial value (0 or "") which were
supposed to be interpreted as NULL.
They led to `operator==` potentially being serialized as 'IS NULL'.

It makes more sense to introduce explicit helpers, e.g.

 - equal_or_is_null(col, optional)
 - not_equal_or_is_not_null(col, optional)
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