I'm not a lawyer, but the actual law says "An employer shall not, orally or in writing, personally or through an agent, seek salary history information, including compensation and benefits, about an applicant for employment." It would probably be up to a judge to determine whether asking for a range could be construed as asking for "salary history." Considering this law is a misdemeanor, which means the potential for jail time, I'd stay on the side of caution until some test cases come out.