Json key are converted to lowercase and case.insensitive" = "FALSE" does not have any effect

[Rajesh2015]

I am using this serde in my glue table however I see the json key are always getting converted to lowercase irrespective of original input.
I tried using case.insensitive" = "FALSE" but without the mapping as I donot need it to be part of separate column instead remain to be part of the payload column which is MAP<String,String>
For example:

 "payload": {
          "cpr_Rate": "10",
          "type":"cpr"
        }

is getting converted

 "payload": {
          "cpr_rate": "10",
          "type":"cpr"
        }

Is my understanding wrong to use case.insensitive" = "FALSE" separately without mapping.Is there any workaround I can do to handle this.

[benzaita]

This seems to have been added in foursquare@1cda976