[BUG] Proxy AOP layer returns reference value but not copy of value.

[LaurenceLiZhixin]

With param like slice: []string , Here is an example:

// input is []string{"hello")
func (i *Impl) Write(input []string){
    input.append(input, "world")
}

The watch values would shows the final value of the param: []string{"hello", "world", but not the real param value []string{"hello"}