If this was an intended functionallity I would class this as a bug introduced by the url checking algorithm.

This error is generated not from the execute method but from the URLArgument type class.

Because an old feature that was an alternative that I just hadn't fully removed. I should remove that code.

See the following code

That is why this exists.

It's for internally tracking when it should be set back as it's not possible as a normal set string.

Why is the setskin command skipping the whitelist check if the input url is reset then?