The latest message here was more than a year ago, but the topic is still
actual.
I think, what we need here is the mandatory function which uses whatever
values passed to %Struct{}.
I.e., I need to enforce integrity of a newly created structure - so this
mandatory function gets called. Structure is immutable - so when we change
it, brand new structure gets created and, again, this function gets called.
Maybe use callback here? Say, default callback just returns the struct. But
being overridden, it can contain any validation logic needed.
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