[vhdl-200x] Backwards incompatibility with std_logic_vector

The vhdl-2008 std_logic_1164 package changes the definition of std_logic_vector.  Previously it was a distinct type from std_ulogic_vector.  In vhdl-2008 it is a subtype of std_ulogic_vector.  This change is not backwards compatible as it can result in homograph conflicts.  For instance:

    function f(x : std_logic_vector) return integer;
    function f(x : std_ulogic_vector) return integer;

Pre-2008 these functions could coexist.  In vhdl-2008 they are homographs and cannot coexist.

Is this a known and expected incompatibility?

Paul

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