When to flush data.
FileCache policy for when to (re)load data from disk.
Cache values in-memory, and automatically load/save them as needed via the specified functions. Actual loading/saving is done via alias functions. KeyGetter may return .init (of its return type) if the resource does not yet exist, but once it returns non-.init it may not return .init again. A bool key can be used to load a resource from disk only once (lazily), as is currently done with LoadPolicy.once. Delayed flush policies require a bool key, to avoid mid-air collisions.
Wraps some data stored in a file on disk.
Placeholder DataPutter argument to indicate no writing.
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ae.sys.persistence.core