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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Actually, I think my previous results were in 64-bit mode already.

By the way, I don't think unconditionally using uint64_t is a good thing
on 32-bit CPUs. uint64_t might be an emulated type, and operations will
then be very slow.
It would be better to switch based on sizeof(long) (for LP64 systems) or
sizeof(void *) (for LLP64 systems).

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