The func httpx.Parse Data struct have a UnmarshalJsonReader's Bug, can't parse []map[string]string structure type.

[bmomhan]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior, if applicable:

1. The code is
   test.http

###
#用户申请退款消息 SPI
POST http://localhost:8888/test
Content-Type: application/json

{
  "order_id": "1234567",
  "refund_reason": {
    "reason_code": [
      123,
      234
    ],
    "desc": "不想要了",
    "show_reason": [
      {
        "123": "货品不足",
        "234": "已经打烊"
      }
    ]
  },
  "product_detail": {
    "product_id": "123",
    "sku_id": "123",
    "name": "小蛋糕",
    "actual_amount": 100
  }
}

###

test_entity.go

type OrderApplyRefundReq struct {
 OrderId       string            `json:"order_id"`
 RefundReason  RefundReasonData  `json:"refund_reason,optional"`
 ProductDetail ProductDetailData `json:"product_detail,optional"`
}

type RefundReasonData struct {
 ReasonCode []int               `json:"reason_code"`
 Desc       string              `json:"desc"`
 ShowReason []map[string]string `json:"show_reason"`
}

type ProductDetailData struct {
 ProductId    string `json:"product_id"`
 SkuId        string `json:"sku_id"`
 Name         string `json:"name"`
 ActualAmount int    `json:"actual_amount"`
}

3. The error is

metrics:
unreadable: protocol error E08 during memory read for packet $m83486f7610663b49,5...
container:
unreadable: could not read string len protocol error E08 during memory read for packet $m4868246c894870ec,4...

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Environments (please complete the following information):**
- OS: [e.g. macOs]
- go-zero version [e.g. 1.3.5]
- goctl version [e.g. 1.3.8, optional]

**More description**
Add any other context about the problem here.

[bmomhan]

change []map[string]string to []map[string]interface{} , parse can pass

[smithyj]

confirm that the question，mapping.unmarshaler parse bug，use json.Unmarshal is ok

[smithyj]

@kevwan

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@kevwan