tedious JSNI primitive casts - JavaScriptPrimitive?

I wonder if anyone has an approach to avoids (or lessen) the tedious instanceof if loops in the following kind of code:

public static void javaMethod(Object value) { 

 if (value instanceof String) {

jsniMethod((String) value);

 } else if (value instanceof Number) {

jsniMethod(((Number) value).doubleValue());

 } else if (value instanceof Boolean) {

jsniMethod((Boolean) value);

 } else { 

       if (value!=null) 

          throw new RuntimeException("not a primitive : " + value.getClass().getName());

 }

}

...

public static native void jsniMethod(String arg) /*-{

    jsMethod(arg);

}-*/;

public static native void jsniMethod(double arg) /*-{

    jsMethod(arg);

}-*/;

public static native void jsniMethod(boolean arg) /*-{

    jsMethod(arg);

}-*/;

and in JavaScript - a single method

jsMethod = function(data) { 

       alert('hello ' + data);

};

Part of the annoyance is tedium, but I often wonder if I might miss a case.  What I'd love is for a class JavaScriptPrimitive or something like that.  JSONValue is pretty close in semantics, but I don't think it works for this use case.

so, then I could write a single

public static native void jsniMethod(JavaScriptPrimitive arg) /*-{

    jsMethod(arg);

}-*/;

and perhaps have a single utility cast method toJavaScriptPrimitive

public static void javaMethod(Object value) { 

  jsniMethod(toJavaScriptPrimitive(value));

}

I've written code like this so often now, I'm resigned to continuing along those lines  - but I am posting here because I wonder if there is a better way?  

Thanks,

Tom

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