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When a multifield type is defined in an asset editor, it will not save as a multi-value property if the author only provides a single value.
Based on this post, that may be expected behavior:
Re: String type for Multivalued Properties - AEM
However, if the author initially provides just one value, then adds a value later, it still does not convert to a multi-value property. This seems more like a bug than intended behavior.
I have tried implementing a fix as outlined in the above-mentioned post, but I have had no luck.
Here is an example of how I have tried to provide a type hint to always force it to be saved as a String array, in an asset editor definition. This doesn't work.
<jcr:root xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
Has anybody made this work?