In CSL, should prefix/suffix match vertical-align?

The style for "Advanced Engineering Materials" use a belt-and-suspenders approach to citations--numerals are both aligned as superscripts and surrounded by square brackets.

I would think that this would be represented by:

<layout vertical-align="sup" prefix="[" suffix="]" delimiter=", " >

However, this places the prefix and suffix on the baseline. What is appropriate behavior for the above syntax & is there a way to achieve the needed citation style?
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