On Monday, 18 July 2022 at 21:23:32 UTC, Antonio wrote:
I will study it in detail and report (if required). May be, I will write the DTO problem with D article if I find time in august.

In my experience null and empty in DTOs usually play the same logical role. It's a very contrived technical difference without practical usage, such distinction is way beyond any business logic. Even if you implement this distinction, I'm not sure anybody will carefully pay attention to it. In languages that make difference between null and empty, null is often replaced with empty to work around problems with null, such codebase can't properly preserve null values.

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