DNS A-records are meant to be used in the configuration of root domains. A CNAME record is not allowed to coexist with any other data. If you use it for the www in www.somedomain.com, or for ghs, this coexistence is avoided, so your proposed usage above (pointing to ghs) is correct. You may check the RFC 1912 standard <http://www.rfc-editor.org/rfc/rfc1912.txt> for more detail.
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