dubbo protocol and dubbo-go-hessian2 can not process (*int32)(nil) corner case

[DMwangnima]

Environment

• Server: Dubbo-go, v3.1.0
• Client: Dubbo-go, v3.1.0
• Protocol: Dubbo

Issue description

defining API

type UserProvider struct {
    Echo func(ctx context.Context, req *int32) (*int32, error)
}

client logic

resp, err := cli.Echo(context.Background(), (*int32)(nil))

dubbo-go-hessian2

Judging v == nil is not enough since (*int32)(nil) has type information.

dubbo-go

/protocol/dubbo/impl/hessian.go

ignore encoding error does not make any sense.

Logs

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