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Add Set schematype
This should probably be checked using "colander.compat.is_nonstr_iter"
Although this may be the way it was coded in deform, and other schema types return null when the cstruct evals boolean false, I think this thing should probably return the empty set rather than null (as an empty set is a valid set, and isn't necessarily, null, it's just empty).
The plan was to keep consistency with all the other types, but I agree - empty set is a valid use case.
empty set is a valid cstruct