improved Util#parseStringToJsonX with support for true, false and null

Author: Barakudum

src/main/java/org/dynapi/jsonschema/gen/Util.java

@@ -10,6 +10,11 @@ protected static Object parseStringToJsonX(String string) {
         if (string.startsWith("\"") && string.endsWith("\"")) return string.substring(1, string.length() - 1);
         if (string.matches("\\d+")) return Integer.parseInt(string);
         if (string.matches("\\d*\\.\\d+")) return Double.parseDouble(string);
-        return string;
+        return switch (string) {
+            case "true" -> true;
+            case "false" -> false;
+            case "null" -> null;
+            default -> string;
+        };
     }
 }