Sort/Order flex-objects by one of the objects’ properties?

I found the answer. I had somehow used typographic single quotes (‘’) instead straight ones ('') for the property name. Alternatively it works without quotes as well.

(1) {% set collection = directory.collection.sort({'release_year': 'DESC'}) %}
(2) {% set collection = directory.collection.sort({release_year: 'DESC'}) %}

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