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The latest patch is based on a relatively stable revision of 3.3. To my
knowledge, _decimal.c and decimal.py are now fully compatible in the
sense of PEP-399.
libmpdec
========
 o New test suite with comprehensive tests against decNumber.
 o Full support for 32-bit compilers (tested with CompCert).
PEP-399
=======
 o cdecimal.c is now called _decimal.c. Instead of importing cdecimal,
 _decimal is transparently imported as decimal (if the C version is
 available).
 o Unified unit tests with 100% code coverage for both decimal.py and
 _decimal.c. For _decimal.c, the tests include all failures of
 Python API functions (requires special patch for testing).
 o deccheck.py now also tests arbitrary input and makes sure that both
 modules raise the same exceptions.
 o Both modules produce the same pickle output for Decimal and Context.
_decimal.c
==========
 o Speed up int/Decimal conversion for integers that fit into a
 single word of a PyLongObject (performance gain is around 15%).
 o real(), imag(), conjugate(), __complex__() support.
 o Fraction and complex comparison support.
 o Decimal constructor now accepts lists as well as tuples.
 o DecimalTuple support.
 o General cleanup and refactoring. The functions for conversions 
 between Decimal and other numeric types are much cleaner now 
 and could be used for a PyDec_* API.