In [class.bit] we find this:

If the value of an enumerator is stored into a bit-field of the same enumeration type and the number of bits in the bit-field is large enough to hold all the values of that enumeration type (9.6 [dcl.enum]), the original enumerator value and the value of the bit-field shall compare equal

This should apply to all values of the enumeration, not only enumerators. This is normatively implied by the wording in [dcl.enum]p8, and CWG are happy to have this handled editorially.