Multiplication of Array and Matrices containing units, fails based on order of input

[orelbn]

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Describe the bug
A clear and concise description of what the bug is.

If I do a multiplication with an array containing units and one without.
It fails if the array containing the units is the first array, but it succeeds if I reverse the order.

To Reproduce
Steps to reproduce the behavior.

multiply("[1m,2m,3m]","[1,2,3]")

[josdejong]

Thanks for reporting Orel!

Help debugging and fixing this issue would be welcome.