Hi! For section ```adoc [attrVal="foo",attrPos] == some section ``` `hasAttribute()` seems to returns `false` for positional (`$positional`) attributes. ```js section.hasAttribute("attrVal") // true section.hasAttribute("attrPos") // false ``` Is that expected behavior? --- ```js section.getAttributes() ``` does have positional attributes returned. ```js { attrVal: "foo", "$positional": [null, "attrPos"] } ``` Is it ok to rely on `$positional` property? Is it public facing property?