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The radio buttons in the <with> directive should behave just like enums. In other words, None should be replaced with <value not set> or <none>. The <none> radio button should disappear when a selection has been made.
I disagree. There is a big difference between enum property editor and with construct. In majority of cases, enum value property will have a default, so the "value not set" option is a corner case. For element properties, there is no concept of a default. The "none" state is both the starting position and important position to be able to return to easily.