[fpc-pascal] Is it always safe to typecast a old style object as its parent?

[Dennis]

TParent = object
   A : integer;
end;

TChild=object(TParent)
   B : integer;
end;


var
   Parent : TParent;
   Child : TChild;


 begin

    Child.A := 10;
    Child.B := 20;

    Parent := TParent(Child );//  is this always safe ? Will it copy 
ONLY the 'A'  field to 'parent'?  Will it overwrite some memory space 
beyond the legitimate boundary of 'parent'?

end.


Thanks a lot in advance.
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