Merge pull request #179 from laurgarn/preserve_null_boxed_primitives_roundtrip

Preserve null boxed primitives roundtrip

Author: jdereg

src/main/java/com/cedarsoftware/util/io/MetaUtils.java

@@ -720,14 +720,18 @@ static Object[] fillArgs(Class[] argTypes, boolean useNull)
         for (int i = 0; i < argTypes.length; i++)
         {
             final Class argType = argTypes[i];
-            if (isPrimitive(argType))
+            if (argType.isPrimitive())
             {
                 values[i] = convert(argType, null);
             }
             else if (useNull)
             {
                 values[i] = null;
             }
+            else if (prims.contains(argType))
+            {
+                values[i] = convert(argType, null);
+            }
             else
             {
                 if (argType == String.class)