I'm finding that if I have the widget mode set to 'Edit selection' and my field cardinality is set to 1, the 'Selections' in the modal can still display multiple files. I would expect that this not be the case.
It looks like the validation on the server doesn't really check this before just doing an array_merge to put the new selection in with the existing selections.
It is likely that the more general cardinality case wants to be solved here (i.e. cardinality > 1 and not infinite), but that's a different set of problems once you add in the prepend/append mode options etc. So I'm going to keep this ticket on track for this particular single selection problem.
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1.0
Widget selector plugins
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