diff -r a83e16b8b825 rt/vm/src/test/java/org/apidesign/vm4brwsr/ExceptionsTest.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/ExceptionsTest.java	Tue Sep 17 15:00:18 2013 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/ExceptionsTest.java	Wed Oct 09 17:04:25 2013 +0200
@@ -94,12 +94,12 @@
         {
             // 2nd invocation
             Object ret = code.invokeMethod(clazz, method, "java.lang.String");
-            assertEquals(ret, Double.valueOf(2));
+            assertEquals(ret, Integer.valueOf(2));
         }
         {
             // 3rd invocation
             Object ret = code.invokeMethod(clazz, method, "java.lang.Integer");
-            assertEquals(ret, Double.valueOf(3));
+            assertEquals(ret, Integer.valueOf(3));
         }
     }
     
diff -r a83e16b8b825 rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Tue Sep 17 15:00:18 2013 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Wed Oct 09 17:04:25 2013 +0200
@@ -64,13 +64,22 @@
         if (expRes instanceof Number) {
             // in case of Long it is necessary convert it to number
             // since the Long is represented by two numbers in JavaScript
-            try {
-                ret = code.invokeMethod(ret, "toFP");
-                ret = code.invokeFunction("Number", ret);
-            } catch (ScriptException ex) {
-                fail("Conversion to number failed in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
-            } catch (NoSuchMethodException ex) {
-                fail("Cannot find global Number(x) function in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
+            if (ret instanceof Number) {
+                Number n = (Number) ret;
+                if (expRes instanceof Double) {
+                    ret = n.doubleValue();
+                } else if (expRes instanceof Integer && n.intValue() == n.doubleValue()) {
+                    ret = n.intValue();
+                }
+            } else {
+                try {
+                    ret = code.invokeMethod(ret, "toFP");
+                    ret = code.invokeFunction("Number", ret);
+                } catch (ScriptException ex) {
+                    fail("Conversion to number failed in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
+                } catch (NoSuchMethodException ex) {
+                    fail("Cannot find global Number(x) function in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
+                }
             }
         }
         return ret;
diff -r a83e16b8b825 rt/vm/src/test/java/org/apidesign/vm4brwsr/VMLazyTest.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/VMLazyTest.java	Tue Sep 17 15:00:18 2013 +0200
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/VMLazyTest.java	Wed Oct 09 17:04:25 2013 +0200
@@ -58,7 +58,7 @@
     }
     
     @Test public void invokeStaticMethod() throws Exception {
-        assertExec("Trying to get -1", "test", Double.valueOf(-1),
+        assertExec("Trying to get -1", "test", Integer.valueOf(-1),
             StaticMethod.class.getName(), "minusOne__I"
         );
     }