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How do you contemplate presenting the user with the option to define a Yes/No field? Is there going to be some sort of setup screen for defining fields?
With two-valued you're going to have to have a way to choose the default value. I wonder if you could set it up so the user chooses the default value? I can see presenting two checkboxes for the default value marked Yes and No. If the user clicks neither, the field becomes tri-valued.
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