* Addressed issue 4 : now using Reflection API for introspection if
it is available (PHP >= 5.1.0).
* The useIncludedFunctions() method is now disregarded if the
Reflection API is available: functions from any included file may be
turned into an RPC method.
* Non-user-defined functions may now be made into methods (e.g.
strtolower()), if the Reflection API is available.
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http://code.google.com/p/json-xml-rpc/>