The zero based index.
Indicates if this is the first action or not.
The zero based index.
The value from the previous operation.
Gets or sets the result value for the callback.
Gets the underlying sequence.
Gets or sets the value for this action and the upcoming ones.
Cancels the whole operation.
Finishes the action as failed and cancels the whole operation.
The reason why the action has failed.
Finishes the action as succeeded.
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A context for an async action.
T Type of the underlying item.