We are currently working on a mechanism where this would be possible and you can 'plug in' your own implementation that decides what is a 'true' value and what is 'false'.
At the moment what you could do is map the column to a 'char' member field in your class and implement the IInstanceCallbacks
interface to check this value and assign the appropriate value to another 'bool' transient field. This way the 'char' fields get persisted to the database and you get/set the value via the 'bool' which is transient (not saved to the database).
Do get back in case you have further questions.
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