Gin jsoniter is not the same as json

jsoniter tag run unit test error:

=== RUN   TestContextRenderIndentedJSON
    context_test.go:757: 
            Error Trace:    context_test.go:757
            Error:          Not equal: 
                            expected: "{\n    \"bar\": \"foo\",\n    \"foo\": \"bar\",\n    \"nested\": {\n        \"foo\": \"bar\"\n    }\n}"
                            actual  : "{\n    \"bar\": \"foo\",\n    \"foo\": \"bar\",\n    \"nested\": {\n    \"foo\": \"bar\"\n}\n}"
                            Diff:
                            --- Expected
                            +++ Actual
                            @@ -4,4 +4,4 @@
                                 "nested": {
                            -        "foo": "bar"
                            -    }
                            +    "foo": "bar"
                             }
                            +}
            Test:           TestContextRenderIndentedJSON

details: https://github.com/json-iterator/go/issues/564 and https://github.com/json-iterator/go/issues/229