[issue4258] Use 30-bit digits instead of 15-bit digits for Python integers.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Following Victor's suggestion, here's an updated patch; same as before, 
except that marshal now uses base 2**15 for reading and writing, 
independently of whether PyLong_SHIFT is 15 or 30.

Added file: http://bugs.python.org/file11947/30bit_longdigit3.patch

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