Serhiy Storchaka added the comment:

Thank you for your review Terry.

You can pass an integer in range from -2147483648 to 2147483647, and it is 
marshalled using the <int> tag. But when you receive tags <i1>, <i2>, etc, they 
are unmarshalled to integer values, and these values can be out of range from 
-2147483648 to 2147483647. How to document all these detail in short?

The same is with other types. xmlrpclib is more conservative with data that it 
sends than with data that it receives. float is marshalled using the <double> 
flag, but the <float> tag is unmarshalled to float too. None and datetime can 
be marshalled only if corresponding option is enabled, but always can be 
unmarshalled. Decimal can't be marshalled, but can be unmarshalled.

For now unmarshalling None is supported from the <nil> tag (this is unofficial 
extension). But Apache XML-RPC server produces tags with namespace: <ex:nil>, 
which is not supported in xmplrpclib. The patch adds the support of tags with 
namespaces, and therefore adds the support of unmarshalling None in Apache 
XML-RPC server format.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26885>
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