I've definitely run into a few cases where interviewers definitely would not proceed with the conversation without a number. Usually they want "what you made" but really they want "what you'll take" so I've had great success just switching the scale from "Salary" to "Total Compensation." Usually a recruiter or HR person who won't move on without a number isn't smart enough to think about the difference and just proceeds as if the number you gave is a salary number. Doing this twice has moved my salary to the very top of the pay scale for my position and location.