No recent changes have had any impact on surveys in progress. No
changes that would have such an impact are planned at this time. We
would be very careful with any change in the survey-taking or response-
recording code to avoid any such impact. If changes that impact
existing surveys were necessary, we would make every effort to
"grandfather" existing surveys so they would use old code and continue
to run as they did before the change. I believe only urgent security
issues would lead us to vary from this approach.
-- Joshua