Stephen,
Would it be possible to leave the columns as text then coerce at the time the data is read from the database? In other words, convert the result of the python expression to a string and store the string in the database. Then, when the result is needed, coerce the string to a more suitable type. In other words, defer when the type needs to be known until the value is used.
This would not be an option, because a reading system is normally not pythonic. And it would not be very user friendly. In normal circumstances the result type should be very easily identifyable - at least for a programmer user...
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