Free Pascal function declaration with missing parameter variable type

[Pasqualish]

The documentation for THandleStream.Read shows:

Code: Pascal  [Select][+][-]

1.  public function THandleStream.Read(
2.   var Buffer;
3.   Count: LongInt
4. ):LongInt; override;

What does it mean when there is no variable type as there is above for "Buffer"?

Edit: I found the answer in the documentation

Variable and constant parameters can be untyped. In that case the variable has no type, and hence is incompatible with all other types. However, the address operator can be used on it, or it can be passed to a function that has also an untyped parameter. If an untyped parameter is used in an assignment, or a value must be assigned to it, a typecast must be used.

[Thaddy]

Note you can also declare a local variable (of any type) as absolute to the buffer parameter in your overridden Read function..
That is missing from the docs?

E.g.:

Code: Pascal  [Select][+][-]

1. program testvarbuf;
2. {$mode objfpc}{$H+}
3. procedure TestMe(var buf);
4. var
5.   s:string absolute buf;
6. begin
7.   writeln(s);
8. end;
9.  
10. var s:string = 'untyped buffer?';
11. begin
12.   Testme(s); // can not pass a literal, needs to be a variable
13.   Readln;
14. end.

In the context of a specific stream you can use this for e.g. records.
I don't like untyped, but sometimes it comes in handy.