Integer From A Float List?!?

[Michael Hoffman]

Peter Otten wrote:
> From the "Evil Coder's Guide to Fast Code":
 >
 > [...]
 >
> $ py24 -m timeit -s "floats = map(float, range(1000))" -s"from itertools
> import starmap, izip" "ints = list(starmap(int, izip(floats)))"
> 1000 loops, best of 3: 343 usec per loop

Truly evil. Why is that faster than "ints = list(imap(int, floats))"?
It is on my system.
-- 
Michael Hoffman