type fieldsCache struct {
	sync.Mutex
	value atomic.Value
}

func newFieldsCache() *fieldsCache {
	cache := &fieldsCache{}
	cache.value.Store(make(fieldsCacheMap))
	return cache
}

var (
	mapStringInterfaceType = reflect.TypeOf(map[string]interface{}{})
	stringType             = reflect.TypeOf(string(""))
	fieldCache             = newFieldsCache()