def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def isexact(self):
        """Matcher will match exactly the list of files in .files() --
        optimization might be possible."""
        return False