It seems numpy's 2**np.array([64]) produces 0, which is a strange result. Why? I guess it has something to do with overflow, but feel unsure.
In [16]: 2**np.array([64])
Out[16]: array([0])
In [17]: 2**64
Out[17]: 18446744073709551616
Why does numpy's `2**np.array([64])` produces 0, whereas plain python's 2**64 gives the correct result?
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