ConcurrencyControl
public enum ConcurrencyControl : UInt8Concurruncy control type used when saving or deleting a document.
- lastWriteWins: The last write operation will win if there is a conflict.
- failOnConflict: The operation will fail if there is a conflict.
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                  Undocumented DeclarationSwift case lastWriteWins = 0
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                  Undocumented DeclarationSwift case failOnConflict
 ConcurrencyControl Enumeration Reference
        ConcurrencyControl Enumeration Reference