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Figure how to type-check relateds at setting time
- Look at MapperRelationships statics?
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On insert/update/delete, look at the PDOStatement and set any returned column values (only good for PostgreSQL, but hey, nice touch.)
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Add a "required" on one-to-one and many-to-one? Existing 1:1 and M:1 are really to-zero-or-one, and "required" is to-exactly-one. Maybe "always".