Keep NULL values as nil when typecasting #28
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Previously, NULL values in the DB arrays were correctly converted to nil in String#from_postgres_array, however this would result either in an error (with e.g. floats) or an incorrect value (with e.g. integers, as nil.to_i => 0).
This preserves NULL values as nil in the resulting Ruby array, and also adds spec coverage for all of the existing typecasting behaviour.