TStreamProc is a type of callback procedure called used by TFiler and descendant DefineBinaryProperty methods.
TStreamProc = procedure (Stream: TStream) of object;
(Stream: TStream) ( TStreamProc)();
DefineBinaryProperty introduces an abstract method that allows descendants to read or write binary data like a property.
Each descendant Filer object declares a DefineProperty method that defines the data that the descendant object will read or write as if the data were a property.
TStreamProc is the callback procedure parameter in that DefineBinaryProperty. When called, it supplies the TFiler or descendant object, allowing binary data read and write access.
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