diff -r 154eb64ce746 -r 0a7c1bb2372d tests/test_json.c
--- a/tests/test_json.c	Fri Dec 27 12:23:14 2024 +0100
+++ b/tests/test_json.c	Fri Dec 27 13:01:31 2024 +0100
@@ -376,6 +376,14 @@
         CX_TEST_ASSERT(cxJsonAsInteger(v) == 12300);
         CX_TEST_ASSERT(cxJsonAsDouble(v) == 12300.0);
         cxJsonValueFree(v);
+
+        cxJsonFill(&json, "18446744073709551615.0123456789 ");
+        result = cxJsonNext(&json, &v);
+        CX_TEST_ASSERT(result == CX_JSON_NO_ERROR);
+        CX_TEST_ASSERT(cxJsonIsNumber(v));
+        // be as precise as possible
+        CX_TEST_ASSERT(cxJsonAsDouble(v) == 1.8446744073709552e+19);
+        cxJsonValueFree(v);
     }
     cxJsonDestroy(&json);
 }
@@ -394,15 +402,6 @@
         CX_TEST_ASSERT(v->type == CX_JSON_NOTHING);
         cxJsonReset(&json);
 
-#if 0 // TODO: discuss if it is intended that this produces -47 as valid value
-        cxJsonFill(&json, "-47,11e2 ");
-        result = cxJsonNext(&json, &v);
-        CX_TEST_ASSERTM(result == CX_JSON_FORMAT_ERROR_UNEXPECTED_TOKEN,
-                        "decimal separator cannot be a comma");
-        CX_TEST_ASSERT(v->type == CX_JSON_NOTHING);
-        cxJsonReset(&json);
-#endif
-
         cxJsonFill(&json, "0.815e-3.0 ");
         result = cxJsonNext(&json, &v);
         CX_TEST_ASSERTM(result == CX_JSON_FORMAT_ERROR_NUMBER,
@@ -451,13 +450,6 @@
             "30 digit int does not fit into 64-bit int");
         CX_TEST_ASSERT(v->type == CX_JSON_NOTHING);
         cxJsonReset(&json);
-
-        cxJsonFill(&json, "18446744073709551615.0123456789 ");
-        result = cxJsonNext(&json, &v);
-        CX_TEST_ASSERTM(result == CX_JSON_FORMAT_ERROR_NUMBER,
-            "numbers with more than 30 characters are unsupported in general");
-        CX_TEST_ASSERT(v->type == CX_JSON_NOTHING);
-        cxJsonReset(&json);
     }
     cxJsonDestroy(&json);
 }