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If the `step` parameter for `itertools.count()` rounds to 1 (f.i., 1.1, 1.437643, 1.99999), then it fallsback to fast (integer) mode and increases the counter by 1. Here's an example:
Python 3.6.0a4+ (default:ddc95a9bc2e0+, Sep 8 2016, 14:46:19)
>>> import itertools
>>> for i in itertools.count(1, step=1.5):
... print(i)
... if i > 10:
... break
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