[Numpy-discussion] Unexpected casting result

Warren Weckesser warren.weckesser at gmail.com
Mon Sep 16 13:54:29 EDT 2013

An unexpected casting result was just reported on stackoverflow:

The following show the essence of the issue:

In [1]: np.__version__
Out[1]: '1.9.0.dev-6ce65d8'

In [2]: type(np.array(1.) * (2**64-1))
Out[2]: numpy.float64

In [3]: type(np.array(1.) * (2**64))
Out[3]: float

Note that the result of `np.array(1.0) * 2**64` is a Python float, not a
numpy float64.  Is this intentional?

(As pointed out in the stackoverflow question, the issue
https://github.com/numpy/numpy/issues/3409 is at least tangentially

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