A way to detect self closing tag

[paulish]

Some systems use self-closing tags to show that tag have null value, some systems use xsi:nil for the same purpose. With xmlbuilder2 we are able to detect that element has xsi:nil attribute but we are not able to detect if tag is self-closing.

First I would like to know is there a way to detect that element is self-closing (I have not found reading the source code and using debugger and documentation but perhaps I skipped something).

And if there is no way then would it be acceptable if I create a merge request for this feature? Or perhaps @oozcitak wants to implement this himself or have contra arguments for this feature?