Expando methods: how to get hold of the object a method is called on

Consider this Expando method:

def stringMetaClass = new ExpandoMetaClass(String.class, true)

stringMetaClass.aMethod << { it.toUpperCase() }

stringMetaClass.initialize()

However, when I call the method "it" is null:

"test".aMethod()

How to get hold in a closure of the object where an Expando method is called on?

Thanks

Steven

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