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    (#217) PrevNext - More conservative transition (5.7=>5.8=>5.9) · f76de01c
    totten authored and eileen's avatar eileen committed
    This revision sets up more conservative transition process for adopting PrevNext drivers.
    
    Before
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    * 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
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    * 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.
    f76de01c