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What if value assigned is Enumerable, but is not Array or Range? (Say, it is ActiveRecord::Relation.) What user expects is it would be converted to_a, and then inserted as a vector. What actually will happen, is pretty obscure error:
when Array, Range would be skipped;
in prepare_value_for_insert, there would be called Array(relation), which will do to_a (producing array of objects)... and then multiplied by DF size, producing vector much larger than expected.