add key stability checking interface
Needed for resuming from chunks. Url keys are considered not stable. I considered treating url keys with a known size as stable, but just don't feel that is enough information.
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5 changed files with 18 additions and 1 deletions
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@ -25,6 +25,9 @@ backend = Backend
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, fsckKey = Nothing
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, canUpgradeKey = Nothing
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, fastMigrate = Nothing
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-- The content of an url can change at any time, so URL keys are
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-- not stable.
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, isStableKey = const False
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}
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{- Every unique url has a corresponding key. -}
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