使用sync.Map类型是否安全？

I would like to define types of sync.Map so that I can have some type checking and basically isolate the interface{} use. Is it safe to use sync.Map like this ?

type WalletMap sync.Map

var walletMap = &WalletMap{}

func (m *WalletMap) LoadOrStore(key string, value *CoinMap) (actual *CoinMap, loaded bool) {
    itf, ok := (*sync.Map)(m).LoadOrStore(key, value)
    if !ok {
        return nil, ok
    }
    return itf.(*CoinMap), ok

}

func (m *WalletMap) Load(key string) (actual *CoinMap, loaded bool) {
    itf, ok := (*sync.Map)(m).Load(key)
    if !ok {
        return nil, ok
    }
    return itf.(*CoinMap), ok

}