BUG: Ensure summed weights returned by np.average always are correct class (#30522) #30523
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Backport of #30522.
Over at astropy, it was noticed that if one passes in a
Quantityweight tonp.average, and asks for the summed weight to be returned, then the unit can be lost if the shapes of the weights and input array do not match (see astropy/astropy#19054). This is because of a missingsubok=Truein a final broadcast -- which this PR fixes (how I wish I had insisted more that that would be default forsubokwhen it was introduced...).