I like this and it does solve an existing problem. I'd drop the and between unset and set, since the _and adds 4 chars, but not much information. unset_set does sound a bit weird though. only giving a +1 for now to see if someone else might come up with better idea; if not I'd +2 this; probably either with or without the _and dropped

Patch set 11:Code-Review +1

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