Maybe one way to address nullability of foreign key associations as well as other field types is as follows. Don't know if it's possible or backward compatible, but here's the concept. Make fields, including FKs, by default non-nullable--setting to Empty/null is an error, and maybe provide a get_! method for foreign keys. Then maybe there could be a wrapper field -- similar to Option and Box -- that delegates to a non-nullable ordinary field. I can't think of a better syntax, so you may have to write object field extends OptionalField(new MappedString(this,100)). Then MappedString would disallow nulls but OptionalField would delegate to MappedString when it's Full and store NULL otherwise. Is that too farfetched?
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