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func (s *MyStruct) pointerMethod() { } // method on pointer
func (s MyStruct)  valueMethod()   { } // method on value

“Whether to define the receiver as a value or as a pointer is the same question, then, as whether a function argument should be a value or a pointer. There are several considerations”.

So may I conclude that everything is passed by value in the usual way, even for struct methods when they get called they provide a copy of what they are. If its a ptr struct it would give a ptr struct to a ptr receiver method otherwise a copy set to the method that is not a ptr receiver. And only exact matches are implemented.