isEmptyValue do not detect interface wrapped nil

[wenerme]

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Expected Behavior

Current Behavior

/*
type Cursor struct {
	ID    models.ID `msgpack:"i"`
	Value Value     `msgpack:"v,omitempty"`
}
 */
func TestMsgPackPanic(t *testing.T) {
	var v Value
	v = (*time.Time)(nil)
	c := &Cursor{
		Value: v,
	}
	log.Println("OK Here")
	_ = msgpack.NewEncoder(bytes.NewBuffer(nil)).Encode(v)
	log.Println("Next panic")
	_ = msgpack.NewEncoder(bytes.NewBuffer(nil)).Encode(c)
}

panic here

func isEmptyValue(v reflect.Value) bool {
	if z, ok := v.Interface().(isZeroer); ok {
		return nilable(v.Kind()) && v.IsNil() || z.IsZero()
	}

Possible Solution

improve isEmptyValue

Steps to Reproduce

code above

Context (Environment)

Detailed Description

Possible Implementation