[issue10044] small int optimization

[Mark Dickinson]

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

Maybe we could consider adding an extra field to a PyLong giving its 'small_int' value for small values, and some flag value for non-small longs.  An extra field wouldn't actually enlarge the size of a PyLong for small values---on a 64-bit machine, a value like 23L takes 28 bytes, for which 32 bytes will actually be allocated (since Python always allocates in multiples of 8 bytes, I believe).

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