jsoniter is not the same as json

[thinkerou]

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: json-iterator/go#564 and json-iterator/go#229