wolfstudy opened a new issue #31: Talk about `send` interface logic 
URL: https://github.com/apache/pulsar-client-go/issues/31
 
 
   **Is your feature request related to a problem? Please describe.**
   
   In `Producer` interface, `Send` is defined as follows:
   
   ```
   Send(context.Context, *ProducerMessage) error
   
   SendAsync(context.Context, *ProducerMessage, func(MessageID, 
*ProducerMessage, error))
   ```
   
   In fact, when the pulsar client receives the `sendReceipt`, we don't assign 
a value to the `ProducerMessage`. The returned value is always nil.
   
   **Describe the solution you'd like**
   
   We can define the interface as follows:
   
   ```
   Send(context.Context, *ProducerMessage) (MessageID, error)
   
   SendAsync(context.Context, *ProducerMessage, func(MessageID,  error))
   ```
   
   This way, on the one hand, it can be consistent with the Java client in the 
interface definition. On the other hand, we only need the msgID field. In this 
regard, if there is a place that is not considered comprehensive, please 
correct me.
   

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