Content-Length header with HEAD requests?

Question

The http spec says about the HEAD request:

The HEAD method is identical to GET except that the server MUST NOT return a message-body in t

Answer 1

The HTTP-spec at W3C states:

If the new field values indicate that the cached entity differs from the current entity (as would be indicated by a change in Content-Length, ...

Which (to me) means it should hold the "correct" value as you would in a GET response.