Allows to get current integer value from the given method value object (XmlRpcMethodValue). This function not only is used to get param values for the type XML_RPC_INT_VALUE. Because the XML-RPC definition says that a boolean value is represented with the integer values 0 and 1, corresponding to axl_false and axl_true, this function is also used to get the value for a XML_RPC_BOOLEAN_VALUE.
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