Clarify broadcasting behavior in vecdot
#473
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This resolves data-apis#471. The existing spec provides conflicting guidance saying both that the axes over which to compute the dot product must be equal, while also saying that input arrays must be broadcast compatible without qualification, thus implying that the contracted axis could also broadcast. This commit explicitly defines broadcast behavior for only the contracted axes, thus bringing vecdot inline with broadcasting behavior in tensordot.
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This PR resolves #471.
The existing spec provides conflicting guidance saying both that the axes over which to compute the dot product must be equal, while also saying that input arrays must be broadcast compatible without qualification, thus implying that the contracted axis could also broadcast.
This PR explicitly defines broadcast behavior for only the contracted axes, thus bringing
vecdotinline with broadcasting behavior intensordot.