Could basePath[0] rase out-of-index panic?

[zltl]

rpcx/client/consul_discovery.go

Lines 47 to 50 in d156b7d

	func NewConsulDiscoveryStore(basePath string, kv store.Store) (*ConsulDiscovery, error) {
	if basePath[0] == '/' {
	basePath = basePath[1:]
	}

Looks danger. Failed to find any caller input that cause panic though. Shall we modify by strings.HasPrefix(basePath, "/") to avoid future crash, or just keep it and use it carefully?