UserUnion 
    Represents the entity that performed the action.
Inheritors
Functions
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                  Casts this UserUnion as a CustomEntity and retrieves its kotlin.String value. Throws an exception if the UserUnion is not a CustomEntity.
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                  Casts this UserUnion as a CustomEntity and retrieves its kotlin.String value. Returns null if the UserUnion is not a CustomEntity.
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                  Casts this UserUnion as a UserArn and retrieves its kotlin.String value. Returns null if the UserUnion is not a UserArn.