Talkback callback that sends instructions to a source.
This function sends a TalkbackKind signal to the source to instruct it to send a new value (pulling) or to be cancelled and stop sending values altogether.
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Talkback callback that sends instructions to a source.
Remarks
This function sends a TalkbackKind signal to the source to instruct it to send a new value (pulling) or to be cancelled and stop sending values altogether.