Add the callback of send operation.#458

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Commits on Aug 14, 2016

Add the callback of send operation.
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Commits on Nov 8, 2016

Improving the method chains and signatures for error:completion: style methods
NathanLi
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Use `[NSValue valueWithRange:dataRange]` as a key of _sendCallbacks.
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Commits on Dec 23, 2016

Change the error message.
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