code: function valuesToStrings(payload) {
  	var stringifiedPayload = {};
  	for (var key in payload) {
  		if (payload.hasOwnProperty(key)) {
  			stringifiedPayload[key] = payload[key].toString();
  		}
  	}
  	return stringifiedPayload;
  }
docs: Convert all fields in a payload dictionary to strings
  
  @param object payload Payload on which the new dictionary is based