Codegen: serialize empty arrays and require them (jsoniter fix) #3655
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Direct follow-up to #3647 - uses new tests to validate implied expectations around required array fields. 'Real' diff is just the last commit here.
Whether this is really the right behaviour may be up for debate, although the new behaviour is the same as that expected by the non-discriminated-oneOf validation code, which will otherwise need to be made more convoluted/draconian.