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This revision sets up more conservative transition process for adopting PrevNext drivers. Before ------ * 5.7.x - Hard-coded to SQL driver. * 5.8.x - Allow setting to pick driver. If left as `default`, then choose best-available (based on configured services). After ------ * 5.7.x - Hard-coded to SQL driver. * 5.8.x - Allow setting to pick driver. If left as `default`, then use SQL driver. * 5.9.x - Allow setting to pick driver. If left as `default`, then choose best-available (based on configured services). This essentially mitigates the risk that bugs in the new Redis driver cause regreessions for sites already running Redis.
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