David,

>I'm concluding that the .astype(np.uint8) is applied after the array is
constructed, instead of during the process.

That is how python works in general.  astype is a method of an array, so
randint needs to return the array before there is something with an astype
method to call.  A dtype keyword arg to randint, on the otherhand, would
influence the construction of the array.

Elliot
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