I have a problem which is basically
x v y
x contains one sort of data and y a completely different sort. For
simplicity let's say v has rank 0 and returns a rank 0 result. I would like
the result to have shape ($x),$y irrespective of the values of $x and $y,
but I cannot (easily) unless one is a prefix of the other.
Why was this rule introduced?
In my particular problem part of $y is pervasive through the process and I'm
introducing additional structure through x.
Regards
Graham
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