Go JSON unmarshaling based on an enumerated field value

In a previous article , we talked about marshaling/unmarshaling JSON with a structure like

{
	"type": "this part tells you how to interpret the message",
	"msg": ...the actual message is here, in some kind of json...
}

Last time, we left a repetitive switch statement in the code, where each message type was unmarshaled very explicitly. This time, we'll talk about ways to clean that up.

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