Why the objects of sysman are created with the data type varchar2 CHAR

Hi,
I have an environment with the following properties,
NLS_LENGTH_SEMANTICS BYTE
NLS_CHARACTERSET AL32UTF8
After I have created the db control repository, I find the data type of the sysman's objects are
VARCHAR2 (64 CHAR)
Why?

NLS_LENGTH_SEMANTICS does not apply to tables in SYS and SYSTEM. The data dictionary always uses byte semantics.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams127.htm

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https://picasaweb.google.com/114804305606242416264/OBIEEError#5663056545119428530
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