Baseline performance (9e6ac83acae):
    
$ ./python -m timeit "12345678 == 12345678.0"
5000000 loops, best of 5: 40 nsec per loop
$ ./python -m timeit "1 == 1.0"
10000000 loops, best of 5: 38.8 nsec per loop
$ ./python -m timeit "(1234578987654321).bit_length()"
10000000 loops, best of 5: 39.4 nsec per loop

Upcoming PR:

$ ./python -m timeit "12345678 == 12345678.0"
10000000 loops, best of 5: 34.3 nsec per loop
$ ./python -m timeit "1 == 1.0"
10000000 loops, best of 5: 34.4 nsec per loop
$ ./python -m timeit "(1234578987654321).bit_length()"
10000000 loops, best of 5: 36.4 nsec per loop