在golang版本之间使用自定义解编程序解析json的差异

I am trying to port some code written against go1.3 to current versions and ran into a case where the json parsing behavior is different between versions. We are using a custom unmarshaller for parsing some specific date format. It looks like recent versions pass in the string with additional quotes which 1.3 did not.I am trying to port some code written against g