Fix collectted variable bug (#500)

* fix bug in convertListVar

* Update CHANGELOG.md

Author: Hajarel-moukh

CHANGELOG.md

@@ -1,4 +1,8 @@
 # Changelog
+## 2.6.10 [TODO]
+### Fixed
+- Aligned the conversion logic for multi-iteration variables with single-value variables during collectedVariables creation to avoid unexpected xxx.0 values for INTEGER variables.
+
 ## 2.6.9 [2026-06-11]
 ### Fixed
 - Delete only expired V2 schedules from dataProcessingContext

src/main/java/fr/insee/genesis/domain/converter/rawdata/RawResponseConverter.java

@@ -164,16 +164,19 @@ private static void convertListVar(
             VariablesMap variablesMap,
             List<VariableModel> destination
     ) {
-        List<String> values = JsonUtils.asStringList(valuesForState);
+        if (!(valuesForState instanceof List<?> values)) {
+            throw new IllegalArgumentException("Object is not a List");
+        }
 
-        if (!values.isEmpty()) {
-            int iteration = 1;
-            for (String value : values) {
-                if (value != null && !value.isEmpty()) {
-                    convertOneVar(variableEntry, value, variablesMap, iteration, destination);
-                }
-                iteration++;
+        int iteration = 1;
+        for (Object rawValue : values) {
+            String value = rawValue == null ? null : getValueString(rawValue);
+
+            if (value != null && !value.isEmpty()) {
+                convertOneVar(variableEntry, value, variablesMap, iteration, destination);
             }
+
+            iteration++;
         }
     }