Because a Pascal compiler parses the interface section of an unit only
once, ...
IMO what would fix a lot of the problem would be a "cross unit forward
declaration", that is a way to tell a compiler "this type is a class
type declared in unit x that is all you need to know for now" (afaict
that is all the compiler needs to know to compile a function prototype
or similar)
The current situation means that a set of interrelated classes often
must either all be put in the same unit or do a lot of typecasting.
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